First, let me say that I do love it! I have been following the build-up and getting hype on this game since last year. I took off work for the demo. And I love it so far. I can't wait for the full game. I was stunned at how good it looked: just amazing. Injustice will be a game I main in 2013, for sure, on a short list of 2-3 titles.
All that said, I have a couple of simple items:
1) The mannish features on the fem characters. I wanted to main Wonder Woman, but it is rough with that jaw. This game looks SO great, yet they are messing it up with the female faces. Notice how Athena is beautiful looking? They can make good-looking fems, so why not? My wife is a cosplayer and this DOES matter. 40% of gamers are women, and overall a lot of women do not like to play games with ugly characters. They'll reject Injustice on that basis alone. PLEASE, NRS, please fix this before it is too late! Raven doesn't have to look distended.
2) I wish games, this one in particular, had more degrees of AI. Like something between Medium and Hard, something between Hard and Very Hard. Like Very Easy, Easy, Mild, Medium, Medium Hard, Hard, Harder, Very Hard, Insane. And AI that is based on real opponents' play, not retroactive impractical reads.