I recently watched 21 (2008,PG-13).  From ScreenIt!:

Recruited by one of his professors, a college student agrees to join an underground card-counting team, but must deal with the repercussions of getting too good at it, all of which draws the watchful eye of Vegas casino loss prevention specialists.

This was probably an interesting story to read, but it didn't work all that well for me as a film...especially Spacey's character.  It could have actually been on target for all I know, but it didn't feel like it to me.  I also don't understand how casino's could possibly get away with kicking the shite out of it's customers or why Ben wouldn't use a bank account.

I give it 3 out of 5.