Forgot to make a list myself:
UMVC3
Best: Viper, Dante, Strider, Felicia, Taskmaster, Rocket Raccoon, Amaterasu, Viewtiful Joe, Wesker
Worst (in a "I get PTSD seeing this" way): Firebrand/Skrull, Hulk match start Wolverine (get used to your fastest normal being 8 frames versus that and you'd always have to mention it here)
Melee
Best: Marth, Falco, Peach, Pikachu, Jigglypuff, Samus, Luigi, C. Falcon
Worst: Sheik but barely
Project M
Best: Marth, Pit, Falco, Falcon, Luigi, Samus,
Worst: 3.02 Mario
Smash 4
Best: Marth (haha), Pit, Greninja (if they existed), Palutena, Luigi, Zero Suit Samus
Worst: NESS. NESS. NESS. Also Sonic.
Vampire Saviour
Best: Hsien-Ko, Q-Bee, B.B. Hood, Jon Talbain
Worst: Sasquatch
Third Strike
Best: Makoto, Urien, Q, Dudley
Worst: American Chun
Guilty Gear XXAC+R & its variants
Best: Baiken, Jam, Johnny, Bridget
Please Stop: Zappa, Zato
Guilty Gear Xrd
Best: Elphelt, Ky, I-no
Worst: Millia, Zato, Axl
I should note that while a few I have here in worst or "don't really care for", there are only a few that outright put me into ResidentSleeper mode. I still can find the entertainment value in derp like round start Wolverine or Hulk, +R Zappa or other things of that nature.
Man, fuck watching Dante. I'd rather watch a match with 6 Dr. Dooms than watch a Dante snoozefest.
Beef is the only acceptable exception to the rule guys, do not take the bait.