I think one issue Injustice suffers from is not so much balance from character to character, but balance within a given character. Each character has dozens of moves, but a couple moves are extremely superior to other ones. So, it isn't just that Superman's f23 is good against other characters. It is that it is so obviously good compared to other options that a Superman player would be silly not to constantly use it. Every character has moves that are really slow or otherwise disadvantaged that they are hardly going to be used. In fact, we are seeing with each character a handful of moves that get repeated while the majority of moves aren't ever used. Thus, we have the allegation, which has some truth to it, that gameplay can visually be repetitive to borderline boring. Superman players are going to be using f23, breath, and eye lasers constantly because they are the best options. I can't fault a player like KDZ since he is playing to win, not playing to have the most visually appealing battle, but his play exemplifies that issue with Superman, even though it is present with most characters. It isn't just that f23 is good, it is that you know it is coming, again and again and again, to the exclusion of most everything else. Maybe part of the 'challenge' of a fighting game is supposed to be figuring out which moves in the character's toolbox are the best and which ones aren't, but that 'challenge' gets met pretty quickly, particularly with sites like TYM, and then we have those handful of BnB moves, BnB combos, and so on over and over again, and I think that is contributing to the feeling of IGAU being a little stale.
Frankly, I wouldn't mind seeing every character get buffs in their 'less used' normals and other strings to give more variety to gameplay.
