The list for scrubs I know would look something like this:
S: Captain Falcon, Marth, Shiek, Falco, Ganondorf, Link
A: Roy, Young Link, Samus, Pikachu, Ness, Zelda
B: Luigi, Mario, Dr. Mario, Fox, Ice Climbers, Kirby
C: Donkey Kong, Mr. Game & Watch, Mewtwo, Peach, Bowser, Yoshi
D: Pichu, Jigglypuff
Justifications:
Falcon Punch is amazing. Show me your moves.
Marth's Usmash is broken (and his Fsmash is decent too)
Sheik's whip is too good
Falco's Fsmash and Dsmash are too good
Ganon's Fsmash and downB are incredible (no one uses his Fair, because everyone knows you can't attack in the air)
Link's UpB is so cool looking
Roy's Usmash is the best move ever
YL is like Link, but not as cool
Samus' fully charged shot is soooooo good
Pikachu's downB is broken, and his neutralB is insanely good
Ness' sideB and neutralB are amazing, and his downB completely ruins Samus
Zelda's smashes are too good. So is that explosion thing that happens above her when she Usmashes in the air
Dr. Mario/Mario/Luigi are all exactly the same
Fox's lasers are useless, but at least he has an Fsmash. He can also sideB to make sure he never gets hit, while being invlunerable because there's no way the other person can hit him during it. His sideB sometimes takes him off the stage, though
IC's have a great projective, and spamming sideB makes them invulnerable
Kirby can suck people up and jump off the stage, that makes him amazing. It's too bad there's no way to break out. He's really bad at everything else, though
DK is big and strong. He's ugly, though, which is why he's this far down
Game and Watch throws bacon at people, and his hammer can KO them
Mewtwo's Shadow Ball is really good, but he floats around all the time and no one can use him
All of Peach's attacks are useless, and she has a terrible recovery. Plus, she's a woman
Bowser can't do anything other than get hit. He's just too big and slow
No one plays Yoshi
Pichu hurts himself. He does have an amazing downB, though. But he hurts himself
All of Jigglypuff's attacks are useless. And her downB puts her to sleep, what's up with that?