i got it about a week ago! I really suck =P
i finally beat story mode. Shao Khan was a bitch omg. 1 hr later i finally realized you have to counter attack him.
I'm doing the challenge tower now. i'm at 62 or something. I'm also trying to finish the game with everyone. What i like about MK games, they really add a lot of stuff in it. Best story in a fighting game. Best endings, not just 2 screens (ahem, MVC3). Lotso characters. Its a really awesome game.