I'm only gonna comment on characters I used.
Sub-Zero doesnt belong in the lowest possible tier. He has a good mid string that is easy to confirm into burst on block or ice ball on hit. There is a gap between F22 and burst but at worst it is a trade. Free 50/50 after MB polar puncture in the corner. High damage character all around. Second only to Cheetah, he has the best F3 in the game. Clone is only 8 frames and can be done in air. Great fwd dash, slide, and MB ice ball make it easy to get in on zoners. His weaknesses are MB burst pushing everyone but 8 characters (and sometimes Cheetah) too far to D1 (not totally useless though). His back walk speed sucks. And he does get creamed by a couple characters, Batman and Ivy immediately come to mind. However he still beats some good characters and I think low mid tier is certainly appropriate for him, he's a good character.
I see Aquaman as being too high on this list. He is an incredible counter pick character but he loses a lot of matchups, certainly more than I see many of the characters he is placed with losing.
Didn't play Green Lantern but I don't think he is that high either.
Not to just repeat everything that has already been said, but Fate is top 5.