Stop casting rappers!

What could've been a good movie was completely ruined for me by the most unrealistic choice for a chess wizard. Typically, a chess wizard should be a social shut-in, normally an old russian dude or some guy who doesn't do well with others. Not some guy who sings about shakin it like a polaroid picture. I swear so many potentially good movies have been destroyed by casting departments doing favors for rap stars. Stop making me try to believe Andre 3000 can act. Oh yeah, Big Puss doesn't exactly cut it for a quantum physics guy either, but that's another discussion.