Best/worst, Supernatural episode

As for season 5 so far,

Best: The End and Changing Channels
Worst: Abandon All Hope, The Children Are Our Future

Season 1
Best: Scarecrow
Worst: Wendigo

Season 2
Best: All breakse loose part two
Worst: Nightshifter

Season 3
Best: Mystery Spot/A very Supernatural Christmas - I can't choose, i love them each for different reasons.
Worst: Malleus maleficarum - bad bad bad.

Season 4
Best: On the head of the pin/The monster at the end of the book/Lazarus rising - I LOVE THEM TO DEATH!!
Worst: It's a terrible life - bored me so much and Heaven and Hell - there are some things which I never want to see again (Titantic window, grace in a bottle, angel fist fights).

Season 5
Best: Changing Channelsd/Abandon All Hope
Worst: The disaster called "Fallen Idols"

S1:
Best - Phantom Traveler
Worst - Hell House

S2:
Best - What Is & What Should Never Be, In My Time of Dying, Playthings
Worst - I seriously can't pick a worst eppy. S2 is one of my fave seasons.

S3:
Best - Mystery Spot
Worst - Ghostfacers

S4:
Best - Yellow Fever, After School Special
Worst - Monster Movie

For season 5, i'm going to go with 3 for each as I don't think I can just pick one hehe.

Best - Point of No Return, The Song Remains the Same, My Bloody Valentine

Worst - I Believe the Children Are Our Future, Hammer of the Gods, Swap Meat

Season 1:
Best: Pilot, Bloody Mary, Home, Faith, Devil's Trap, Hell House.
Worst: Route 666, Bugs, Hookman, The Benders, Salvation.

Season 2:
Best: All Hell breaks Loose I/II, Burn under a Bad sign, Croatoan, Crossoad Blues, Houses of Holy, Hunted, Playthings...
Least: No exit, Children Shouldn't Play with Dead Things, Usual Suspects, Hollywood Babylon, Folsom Prison Blues, Nighshifter.

Season 3:
Best: Mystery Spot, Bad Day at Black Rock, The Kids are alright, Freshblood, A very Supernatural Christmans, Sin City, Bedtime Stories.
Worst: Ghostfacers, Time is on my side, Long Distance Call, Magnificent Seven, No rest for the Wicked.

Season 4:
Best: Lazarus Rising, Yellow Fever, Its the Great Pumpkin Sam Winchester, The monster at the end of this book, Lucifer Rising.
Worst: Family Remains, Sex and Violance, Wishful Thinking, Heaven and Hell.

Season 5:
Best: Swang Song, My bloody valentine, the song remains the same, The end, sympathy for the devil, good god y'all, free to be you and me...
Worst: Abandon all hope, dead man don't wear plaid, swap meat, the dark side of the moon...

Season 1

Best: Devil's Trap
Worst: Provenance

Season 2

Best: What is a What Should Never Be
Worst: Roadkill

Season 3

Best: Time Is On My Side
Worst: Ghostfacers

Season 4

Best: Lazarus Rising
Worst: Criss Angel Is A Douchebag

Season 5

Best: The End
Worst: Swan Song

Season 5

Best: The End, Point of No Return, Good God Y'all, My Bloody Valentine

Worst: Swan Song, Swap Meat, Fallen Idol

Season 1
Best: Pilot, Bloody Mary, Home, Faith, Shadow, Hell House
Worst: Bugs, Route 666, The Benders

Season 2
Best: In My Time of Dying, Playthings, Houses of the Holy, Born Under a Bad Sign, Tall Tales, Roadkill, Heart, What Is and What Should Never Be, All Hell Breaks Loose Pt 2
Worst: No Exit, The Usual Suspects

Season 3
Best: Bad Day At Black Rock, Fresh Blood, A Very Supernatural Christmas, Mystery Spot, No Rest For The Wicked
Worst: The Magnificent Seven

Season 4
Best: Lazarus Rising, Metamorphosis, Yellow Fever, It's The Great Pumpkin Sam Winchester, I Know What You Did Last Summer, Heaven and Hell, Sex and Violence, On The Head of a Pin, The Monster at the End of this Book, When the Levee Breaks, Lucifer Rising
Worst: Family Remains, Criss Angel is a Douchebag

Season 5
Best: Sympathy for the Devil, Free To Be You and Me, The End, Changing Channels, The Song Remains the Same, My Bloody Valentine, Dark Side of the Moon, Point of No Return, The Devil You Know, Swan Song
Worst: Fallen Idol, 99 Problems