All they needed was Jean Reno. Depardieu, Hallyday, Renaud, Taghmaoui and the lesser known, Freiss and Dray make up a gang of complete screw-ups who are set up to take a fall and wind up robbing Keitel, always great as a mafioso, and get involved in every kind of mess-up imaginable. The ending is charming and remindful of the ending in Lock, Stock and Two Smoking Barrels. Although the film is quite violent, and liberally sparkled with gallows humor, it comes off incredibly well as a dark comedy. Depardieu does well with comedy and his chemistry with the rest of the bunch is superb in all their antics.
If you haven't seen it, do. If you have, rent it again. I had to, in order to pick up on some of the laughs I missed while guffawing the first time around. Even if you don't speak French, the subtitles are cleverly apt and capture most of the witty dialogue among these veteran French actors.