It's hard to judge this crap when you rarely fight good players playing these other characters. I have experience with like half the cast.
Here's what I think of the matchups in which I've played some pretty solid players:
Batman (4-6)
Superman (3-7 or 4-6)
Aquaman (5-5)
Wonder Woman (5-5)
Green Lantern (4-6 or 5-5)
Nightwing (3-7)
Black Adam (4-6)
Grundy (7-3)
Lex (7-3)
Raven (6-4)
Doomsday (6-4)
And I am 100% sure my feelings could easily change if I got to sit down and play a ton of matches against someone really good on a lot of these characters.
Here's what I think of the matchups in which I've played some pretty solid players:
Batman (4-6)
Superman (3-7 or 4-6)
Aquaman (5-5)
Wonder Woman (5-5)
Green Lantern (4-6 or 5-5)
Nightwing (3-7)
Black Adam (4-6)
Grundy (7-3)
Lex (7-3)
Raven (6-4)
Doomsday (6-4)
And I am 100% sure my feelings could easily change if I got to sit down and play a ton of matches against someone really good on a lot of these characters.