Though it still has a few weaknesses, 2K Sports has improved its mobile basketball game for the 2012-2013 season and added a multiplayer option via Game Center and Bluetooth, which is a nice addition. While it still feels like a stripped-down version of its console counterpart, it remains the best basketball game in the App Store (OK, there isn't much competition).
You can play using the "classic" control scheme with a virtual joystick and virtual pass and shoot buttons. Or you can go with the simplified "one-finger" scheme. I wish that you could call some plays (or at least call for a pick) and that the facial mapping was better (a lot of players don't look anything like how they do in real life). But 2K13 is still a lot of fun to play.