Buddy cop-movie, which follows most of the formulae and tropes of the genre, with the two chalk and cheese protagonists played be female leads. Which, in itself, gives a little edge, and just about gives it some interest for a viewer who might otherwise tire of the set pieces, or pull up a little at the blasé attitudes towards police brutality which is thrown into the film on more than one occasion. The pace is generally fine, though the whole thing outstays its welcome a little, before running out to a somewhat clichéd ending. Not terrible; not great. Some enjoyable exuberance from Melissa McCarthy, without which, the whole thing might have sunk.