Not great, not awful. Heist kind of outsmarts itself every chance it gets with somewhat anticlimactic results. The dialogue is great and its worth watching for Danny DeVito and the rest of the cast alone, but it kind of comes off like a Tom Clancy heist picture that seriously skimps on excitement.
It goes without saying how good the dialogue is. That being said, like a lot of the Mamet's films, this feels a little sleepy and the performances can be automaton-like at times; a shame given HEIST having such a talented cast. Might stick with just reading the guy's plays.
Crackling little yarn with snappy dialogue and more twists than a snake with St. Vitus' Dance. Not exactly anyone's finest hour, but then it's not anyone's worst either. Remember: don’t tie your shoes without a backup plan!