I figured this was a good place to post this, so I just wanted to say to people coming from MK9; there are two things I think it'd be great if we could get past:
1) "Is this character a rushdown char or a zoner?"
2) "I played Sonya in MK9, which character is the same in Injustice?"
Injustice, character-wise, is it's own game. While there are a couple of obvious categorizations, a lot of the cast cannot be pigeonholed into a single basic category. There are diverse sets of tools, and something as simple as 'zoner' or 'rushdown' doesn't really describe how most of the characters were meant to be played.
Add to this that there aren't a ton of direct analogies to MK9 chars in overall gameplay; a character having a cartwheel doesn't make her Sonya Blade. Etc. From having played a lot of the cast, and given that much is different in the meta-game, it's best to just learn a character for what they are, rather than trying to make some char play like Kabal or Reptile.
So please, just take the game for what it is. The engine will feel familiar to MK9 players, but the characters are creative and varied and should be treated as such