It's your basic comedy idea; What if instead of following the competent mafia guys around, we follow the lowest of the low? The mafia guys whose primary job is to get the top mafia guy's laundry. And what if they were so incompetent that they screwed up so the whole mob came after them, and they had to rely on thier abilities to survive?
It's not bad, but it's a basic concept that isn't really deviated from very much. Things go wrong, get out of control, and we discover that our incompetent guys actually have some ability after all. Quelle suprise.
Mind you, it was never meant to be a suprising film, now was it? It is what it is, and isn't a bad version of that.
Watchable, if you're bored.