There was a time when any movie with Bruce Willis in it was likely to be pretty much a large budget and above par production. Recently though I have come across Red, 16 Blocks and now this poor excuse of a movie; all of which suggest that Bruce is certainly not the guarantee he once was.
Cop Out (aptly named!) is banal, childish and vulgar to an extreme. Eddie Murphy got away with it in Beverley Hills Cop, as he did with Nick Nolte in 48 Hours because they were quite original, exciting and very funny. This movie tries to follow in the path of the two cop style action/comedy theme, but really does fail to deliver much more than the odd chuckle and countless cringes at the adolescent profanity that litters the film. (I really don't mind swearing in movies when it add to scenes, situations or character portrayal - Raging Bull, Scar Face etc - but here it was actually quite embarrassing).
The storyline is well covered by fellow reviewers, so needless to say much more than I really found the movie to be quite lame and unremarkable without much to set it aside from countless other, low budget cop movies.
Not necessarily one to turn off, but certainly not one to watch again or recommend, I'm afraid.