It’s awfully hard to make Las Vegas look boring, but this based-on-fact story about a group of MIT math students who count cards at blackjack tables in Vegas does its best. From its glum lead actor (Jim Sturgess) to its crummy digital cinematography (poor Kate Bosworth looks like she’s pushing 50), 21 is the anti-Ocean’s Eleven. You’d find more glamour and excitement at the local OTB.