Ok so best to worst is not the same as favorite to least favorite.
This is my favorite to least favorite list:
Sacrifice
Everybody Hates Hitler
The Great Escapist
Remember The Titans
Citizen Fang
Torn and Frayed
What’s Up Tiger Mommy
Taxi Driver
A Little Slice of Kevin
Goodbye Stranger
As Time Goes By
Hunteri Heroici
Clip Show
Heartache
We Need To Talk About Kevin
Pac-Man Fever
Trial and Error
LARP and The Real Girl
Man’s Best Friend With Benefits
Freaks and Geeks

Bitten
Blood Brother
Southern Comfort

I have said this before but I seriously dislike SC and would leave it off the list altogether cause it annoys the hell out of me. Blood brother seems like it is from a different show. Bitten makes me seasick.
Having said that those three are better thought out and produced episodes than (at least) MBFWB and F&G (the internal show logic being poor in both of these, and F&G being the (for me) 'oh my god why is Sam in this show at all?' last-straw episode) so for best to worst the last 5 would probably be:

Bitten
Blood Brother
Southern Comfort
Man’s Best Friend With Benefits
Freaks and Geeks

This is fun

Sacrifice-Love
Pac Man Fever
The Great Escapist
Taxi Driver
Everybody Hates Hitler
Hunteri Heroici
LARP and the Real Girl
Clip Show
Goodbye Stranger
A Little Slice of Kevin
As Time Goes By
We Need to Talk About Kevin
Blood Brother
What's Up Tiger Mommy
Bitten
Heartache
Citizen Fang
Trail and Error
Freaks and Geeks
Torn and Frayed
Remember the Titans
Southern Comfort- Grrrrr
Man's Best Friend with Benefits

Some of my choices were purely emotional choices, not always about if the episode was well-done or not.

Sacrifice
goodbye stranger
Blood brother
the great scapist
citizen fang
clip show
taxi driver
trial and error
A little slice of Kevin
we need to talk about Kevin
as time goes by
what’s up tiger mommy
larp and the real girl
Pac man fever
hunter heroic
southern comfort
torn and frayed
everybody hates hittler
remember the titans
freaks and geeks
heartache
bitten
man’s best friend with benefits

Hehe! This is fun! Here's my list:

1 Sacrifice
2 The Great Escapist
3 Everybody Hates Hitler
4 Pac Man Fever
5 Trial and Error
6 Goodbye stranger
7 Torn and Frayed
8 Clip Show
9 LARP and the Real Girl
10 As Time Goes By
11 Southern Comfort
12 Blood Brother
13 Citizen Fang
14 Remember the Titans
15 A Little Slice of Kevin
16 Hunter Heroici
17 We Need to Talk About Kevin

18 What’s Up Tiger Mommy
19 Heartache
20 Bitten

21 Freaks and Geeks
22 Taxi Driver
23 Man’s best friends with benefits

I was actually pretty happy overall with most of the episodes all the way until my number 17. I've placed SoCo, Blood Brothers and Citizen Fang higher than most people. Even though the boys were at each other's throats I found those episodes easier to take than the reveal of Sam not looking for Dean (that awful, horrid plot choice!!! arg!) that we got in the first three eps, so for me, those are placed lower on the list. I had a terrible time with the last three and I felt that they were all awful. Dislike Krissy the wunderkind, but the wholesale destruction of canon in Taxi Driver and the unmitigated BLICK factor of Man's Best Friends... have those two tied for worst of the year for me, and possibly worst of the series. So all in all, 17 strong episodes and 2-3 decent ones with only 3 stinkers seems like a good season IMO.

Whooo I'm one of the few people who actually liked 'Bitten' a lot... amd doesn't have 'Sacrifice' as #1. Oy! Here's my list.

Pac-Man Fever
Sacrifice
Everybody Hates Hitler
Goodbye Stranger
Trial and Error
Bitten
LARP and The Real Girl
Hunteri Heroici
The Great Escapist
Clip Show
As Time Goes By
Taxi Driver
Torn and Frayed
We Need To Talk About Kevin
A Little Slice of Kevin
What’s Up Tiger Mommy
Citizen Fang
Heartache
Blood Brother
Southern Comfort
Remember The Titans
Freaks and Geeks
Man’s Best Friend With Benefits

It's very interesting that a overwhelming majority have the same best and worst! I think that's something that's never happened in the other years. There's still plenty of others to give their lists though, but I'm surprised. Okay, maybe not about the worst!

1. Sacrifice
2. Pac-Man Fever
3. LARP and the Real Girl
4. The Great Escapist
5. Clip Show
6. Goodbye Stranger
7. Trial and Error
8. Everybody Loves Hitler
9. As Time Goes By
10. Taxi Driver
11. Torn and Frayed
12. Hunter Heroici
13. Southern Comfort
14. We Need to Talk About Kevin
15. Blood Brother
16. Citizen Fang
17. Freaks and Geeks
18. A Little Slice of Kevin
19. Remember the Titans
20. What's Up, Tiger Mommy?
21. Heartache
22. Man's Best Friends with Benefits
23. Bitten

The top two are way above the rest just as the bottom two are far, far below the rest!

Thanks Alice! This was fun

Sacrifice
As Time Goes By
Blood Brother
LARP and the Real Girl
A Little Slice of Kevin
We Need To Talk About Kevin
Hunteri Heroici
Citizen Fang
What’s Up Tiger Mommy
Taxi Driver
Goodbye Stranger
The Great Escapist
Pac-Man Fever
Clip Show
Everybody Hates Hitler
Trial and Error
Remember The Titans
Bitten
Heartache
Southern Comfort
Freaks and Geeks
Torn and Frayed
Man’s Best Friend With Benefits

Okay, I'm going to be the first to put my reasons for my rankings. Sorry, I couldn't help myself after I finished ranking them in the allotted 5 minutes. It was too much fun

1. Sacrifice – Sublime, almost perfect episode; kudos to the actors and creative teams

2. Pac-Man Fever – Charlie, her Mum & The Hobbit storyline had a personal connection for me.

3. The Great Escapist – Metatron’s introduction & Sam resonating (his Sir Galahad memory is one of my favourite scenes of the season)

4. Everybody Hates Hitler – Classic Ben Edlund script; it contains my favourite line of the season (“Oh my God… these guys are psychotic”)

5. LARP and the Real Girl – Pure escapist fun. Dean and Sam in costume

6. Clip Show – Tense, on the edge-of-my-seat drama.

7. Goodbye Stranger – Brutal opening scene, farewell to Meg & one of my favourite season 8 endings (Cas on a bus; Supertramp blaring).

8. As Time Goes By – Introduction of Men of Letters. Totally awesome!

9. Citizen Fang – Learning Benny’s backstory; plus some of the best camera angles of the season (including that scene of Dean driving up to Elizabeth, who was sitting on the diner’s doorstep).

10. Torn and Frayed – The brothers chose each other.

11. Taxi Driver – I loved this episode; it’s only lower in the ranking because I think it really needed to be two episodes & there was some shaky writing. But it contained some of the best scenes of season 8 (Dean & Benny/Crowley & Kevin/Sam & Bobby/Sam & Dean).

12. Hunter Heroici – I love it when Supernatural tries something new like introducing Looney Tunes; plus it was wonderful to see Mike Farrell (aka BJ in MASH).

13. We Need to Talk About Kevin – Sam & Dean back together, finding Kevin & the revelation about closing the gates of Hell.

14. A Little Slice of Kevin – Castiel is back; Crowley gets serious.

15. Blood Brother – Dean reuniting with Benny for the first time & Sam’s handyman flashbacks

16. Trial and Error – Loved the completion of the first trial and the brother moments; didn’t care much for the family they saved.

17. Remember the Titans – Not a huge fan of the Gods’ episodes, but I did enjoy this episode.

18. Freaks and Geeks – It was good to see Krissy again.

19. What’s Up, Tiger Mommy? – Loved the sassiness of Kevin’s mom.

20. Southern Comfort – Favourite Garth episode & I loved the shout-outs to Bobby in it.

21. Heartache – Fairly average monster of the week story.

22. Bitten – I applaud the risk taking by the creative team at Supernatural, but I personally felt no emotional connection to the young protagonists in this episode.

23. Man’s Best Friends with Benefits – I think it’s the only time I’ve ever felt really flat at the end of an episode. Maybe because this was about a friend of Sam & Dean’s we’d never met. There was even less connection for me here than in Bitten.

Ok here's my list.
I didn't time myself as I knew I would surpass the 5 minutes.
Some of the Titles are simular so I had to look up the synopsis to make sure I had right ones.
Sacrifice
The Great Escapist
Everyone hates Hitler
LARP and the Real Girl
Hunteri Heroici
Pac-Man Fever
Goodbye Stranger
As Time Goes By
Blood Brothers
Trial and Error
Torn and Frayed
A Little Slice of Kevin
Clip Show
Taxi Driver
Remember the Titans
We Need to talk about Kevin
What’s Up Tiger Mommy
Heartache
Southern Comfort
Citizen Fang
Bitten
Freaks and Geeks
Man’s Best Friend with Benefits

Sacrifice
Clipshow
Great Escapist
PacMan Fever
Everybody hates Hitler
Hunteri Heroici
Southern Comfort
As Time Goes by
LARP and the real girl
Taxi Driver
Goodbye Stranger
Trial n Error
A Little slice of Kevin
We need to talk about Kevin
What's up Tiger Mommy
Heartache
Blood Brother
Man's best friend w benefits
Remember the Titans
Citizen Fang
Freaks n Geeks
Bitten

Such a good season - so difficult to rate.

Wow... this is a lot tougher than I thought; very few episodes I didn't particularly care for this season.

1. The Great Escapist
2. Sacrifice
3. As Time Goes By
4. Pac-Man Fever
5. Everybody Hates Hitler
6. Torn and Frayed
7. Goodbye Stranger
8. Clip Show
9. LARP and The Real Girl
10. Hunteri Heroici
11. Citizen Fang
12. Trial and Error
13. Taxi Driver
14. Southern Comfort
15. We Need To Talk About Kevin
16. A Little Slice of Kevin
17. What’s Up Tiger Mommy
18. Bitten
19. Heartache
20. Blood Brother
21. Remember The Titans
22. Freaks and Geeks
23. Man’s Best Friend With Benefits

So I haven't done my list yet but why does everyone seem to hate Southern Comfort so much? Is it because of what Dean said when he was being possessed by the spector?? Cause I don't get it, I thought it was a good episode. Gotta love Sam's "Burn a Confederate solider in a town full of rednecks...Sure !"

1) Sacrifice (doesn't need explanation)
2) The Great Escapist (BE, you're great)
3) Clip Show
4) Citzen Fang (I hate the boys fighting, and this one was them at their lowest, but the episode was amazing. I was tense, at the edge of my seat the whole time)
5) A Little Slice of Kevin
6) Torn and Frayed
7) Goodbye Stranger
Hunteri Heroici
9) As Time Goes By
10) Everybody Hates Hitler
11) Trial and Error
12) Blood Brothers
13) We Need to Talk about Kevin
14) Heartache
15) Pac-Man Fever
16) Taxi Driver
17) What’s Up Tiger Mommy
18) Remember the Titans
19) Southern Comfort
20) Bitten
21) LARP and the Real Girl (just because I don't like the fairy/other dimension mythos - too much True Blood for me)
22) Freaks and Geeks (I can't warm up to Krissy enough to fully enjoy an episode she's in)

Under another cathegory entirely;

- Man’s Best Friend With Benefits (this one is simple the worst of the SERIES, not only the season. The only one EVER I've watched once and don't intend to watch again. Just want to pretend it never existed).

This is really fun! My list is purely emotional. I hope that is ok. So it is probably not exactly best to worst, which would require analysis, but good feelings to bad feelings. I wrote this note after I failed the test at almost 7 minutes, so, "Why not write a paragraph?" I said to myself. My emotions made me start with my worst and best and try to order the rest.

1. Sacrifice
2. Great Escapist
3. Pac-Man Fever
4. Clip Show
5. Everybody Hates Hitler
6. LARP and the Real Girl - Sam's ponytail, Dean having fun
7. Goodbye Stranger
8. As Time Goes By
9. Taxi Driver - Bobby's soul, big hug
10. We Need to Talk About Kevin - Didn't look for Dean?
11. Citizen Fang
12. What's Up Tiger Mommy? - Don't like obnoxious Ms. Tran.
13. A Little Slice of Kevin
14. Hunter Heroici - love Looney Tunes; can't help it.
15. Blood Brother
16. Trial and Error - Could not even remember the woman or the family.
17. Remember the Titans - Don't like impotent gods.
18. Freaks and Geeks - creepy ex-shtriga bringing kids into his house? Teaching them to put themselves in danger. Really?
19. Southern Comfort
20. Torn and Frayed - I need burning faces, torture and screaming in smaller doses.
21. Heartache
22. Man's Best Friend With Benefits - Yuck
23. Bitten - When is SPN going to begin? It's over? Seriously?

I don't need to see MBFWB or Bitten ever again. Yuck and no SPN did it for me.

The finale was so wonderful that for me it was "wondrous." (But of course, it left me some things to wonder about. *sorry, please, i can't help it*

Most/some fans are impatient with this and keep saying that we have learned all that we are going to learn. But those fans said the same thing before Sacrifice aired!

I understand that Sam had multiple reasons why he didn't look for Dean. It would just make my soul happy to know what he did immediately after Crowley told him he was alone until he ran into Amelia's office. Now that the boys are talking, you never know!

1. Sacrifice
2. The Great Escapist
3. Citizen Fang (love Benny)
4. Torn and Frayed (too much gore, but scary Cas)
5. Goodbye Stranger
6. Pac-Man Fever
7. Heartache
8. Hunteri Heroici
9. LARP and the Real Girl
10. Blood Brother
11. We Need to Talk About Kevin
12. Taxi Driver
13. A Little Slice of Kevin
14. As Time Goes By
15. Everybody Hates Hitler
16. Trial and Error
17. What's Up Tiger Mommy
18. Southern Comfort
19. Remember the Titans
20. Clip Show (this is low as I hated Sarah being killed)
21. Freaks and Geeks
22. Man's Best Friend with Benefits (Icky)
23. Bitten (Boring)

If I had more time I would rearrange the middle ones a bit.
From about 11 to 16 anyway.

I wish I could say that I got this done in the specified time, but I'll honestly say it took me twice that. Probably because I try not to watch the episodes again after the air-date so that when I get the DVD it feels semi-new again, and I get to make all new discoveries. So I had to read a couple episode guides to match up title to memory. This was so hard.

1) Sacrifice-This one has made it into my top five now, I think.
2) Trial and Error
3) The Great Escapist
4) Torn and Frayed-I was on the edge of my seat during Samandriel's torture
5) Goodbye Stranger-On the edge of my sanity watching Cas pummel Dean
6)A Little Slice of Kevin
7) Clip Show
Southern Comfort-Garth has so grown on me. I like him so much.
9) As Time Goes By
10) Pac-Man Fever
11) Hunteri Heroici
12) Taxi Driver
13) LARP and The Real Girl
14) Everybody Hates Hitler
15) Blood Brother
16) Heartache
17) Freaks and Geeks
18) What's Up Tiger Mommy
19) Citizen Fang
20) Remember The Titans
21) We Need To Talk About Kevin
22) Bitten-I liked the idea behind this one, but I couldn't connect with the kids at all.
23) Man's Best Friend With Benefits-I can't bring myself to actually dislike this one outright, there's always something I can find to like about an episode. But it's iffy.
This was fun!

Sacrifice
Pac-Man Fever
The Great Escapist
Goodbye Stranger
As Time Goes By
e Need To Talk About Kevin
Taxi Driver
Clip Show
Southern Comfort
Hunteri Heroici
LARP and The Real Girl
Everybody Hates Hitler
Heartache
What’s Up Tiger Mommy
Blood Brother
A Little Slice of Kevin
Citizen Fang
Trial and Error
Remember The Titans
Torn and Frayed


Man’s Best Friend With Benefits
Freaks and Geeks
Bitten

My favorites from each season always tend to be some of the final eps of that year. This is one show that really knows how to crank up the angst for that final stretch run.

My top 2 for this year though pulled away from the pack, Sacrifice and Pac Man Fever.

The bottom 3 didnt work at all for me. The supporting casts in the first 2 were pretty bad. And making Sam and Dean supporting cast in their own show for Bitten was a misstep. But every season has their blah eps. The rest of them...enjoyed them all.

Blood Brother
Sacrifice
Citizen Fang
Southern Comfort
Larp and the Real Girl
Pac-Man Fever
Goodbye Stranger
Taxi Driver
The Great Escapist
Clip Show
As Time Goes By
Torn and Fray
We Need To Talk About Kevin
What’s Up Tiger Mommy
Heartache
Bitten
A Little Slice of Kevin
Hunteri Heroici
As Time Goes By
Everybody Hates Hitler
Trial and Error
Remember The Titans
Man’s Best Friend With Benefits

Whoops-forgot one
Right after Sacrifice, I forgot to put
Everybody Hates Hitler

Okay, this is mine, but the list is not emotional, this is my "that episode was really well done on all fronts list" Emotionally, PAC Man Fever and LARP would be placed much higher.

Sacrifice
The Great Escapist
Everybody Loves Hitler
Trial and Error
Citizen Fang ( seriously well written episode IMO)
Goodbye Stranger
Pac Man Fever
LARP and the Real Girl
Remember the Titans
Hunteri Heroici
Clip Show
As Time Goes By
Torn and Frayed (underwhelming but generally just fine, and the shrubbery thing continues to amuse me)
Southern Comfort ( it hurts, but it wasn't boring)
A Little Slice of Kevin
We Need to Talk About Kevin
Blood Brother (much as I love Ben Edlund, and thought the script was okay, Benny the Middle Aged Edward Cullen was too much for me to stomach)
What's Up, Tiger Mommy
Taxi Driver (a.k.a I Killed Canon Dead)
Freaks and Geeks
We Need to Talk About Kevin (meh)
Bitten ( music saves this from last spot)
Man's Best Friend with Benefits
Heartache

I cannot watch Heartache simply because I fall asleep midway through it every time I try to watch it, and have, as of today, never completed even a single viewing of it.

I hope that it's okay that my list is quite short. Show lost me for a while in S8 and I didn't come back to it until As Time Goes By. After the last 4 episodes my SPN love is sky high once again.

Sacrifice.
The Great Escapist
Pac Man Fever
Clip Show
As Time Goes By
Trial and Error
Everybody Hates Hitler
Taxi driver
We Need To Talk about Kevin
Heartache
Goodbye Stranger
Remember The Titans
What’s Up Tiger Mommy
Man’s Best Friend With Benefits
Freaks and Geeks.

Wow. 5 minutes. Never managed this before and I even had to look up some of the eppies descriptions 'cause all Kevin focused and Benny focused eps kinda blur together. Funny how my faves are all from the secondpart of the season ;)

The last 5 are just simply the worst of the worst :(


Sacrifice
Pac-Man Fever
The Great Escapist
Everybody Hates Hitler
Goodbye Stranger
Remember The Titans
As Time Goes By
LARP and The Real Girl
Clip Show
Trial and Error
Remember The Titans
We Need To Talk About Kevin
What’s Up Tiger Mommy
A Little Slice of Kevin
Hunteri Heroici
Citizen Fang
Torn and Frayed
Taxi Driver
Blood Brother
--
Freaks and Geeks
Heartache
Southern Comfort
Bitten
Man’s Best Friend With Benefits

This is too hard!! I loved this season so much. I think I will try this task again after a rewatch from beginning to end. Yup, season 8 is just too much straight up SPN goodness too pick from!

An approximate ranking:
Sacrifice
Goodbye stranger
Everybody hates Hitler
The great escapist
Pac man fever
Hunteri heroici
Little slice of Kevin
Trial and error
Blood brother
LARP and the real girl
We need to talk about Kevin
Southern comfort
As time goes by
Torn and frayed
Citizen Fang
Clip show
Heartache (what – after a few hundred years a Mayan god looks white???)
Bitten (not as bad as it’s painted – but not nearly enough Winchester to make anybody happy)
Taxi driver (in & out of hell in 30 seconds flat WTF?)
Remember theTtitans (I'd rather not)
Man's best friend with benefits (ick)
Freaks and geeks (fell asleep during this one)
Whats up tiger mommy (unpopular opinions, I know, but I hated the auction & hated momma Tran)