"Kick-Ass 2" is more a string of semi-outlandish plot points strung together without much momentum, rather than the full fledged crime epic the original aspired to be. Gone is the novelty of 12-year-old Chloe Grace Moretz dismembering people while Nicolas Cage runs around in a Batman costume, replaced instead by the novelty of a huge ex-KGB woman crushing skulls while Christopher Mintz-Plasse runs around in his dead mother's kinky leather lingerie, which I'll admit is still pretty good for laughs. And laughs are the big redeemer here. Almost all things are forgiven because the movie's funny. The jarring tonal shifts. The looping character arcs. The fact that the movie doesn't know what worldly lesson it means to convey, and so goes for all of them simultaneously, to the point of contradiction. Yes, forgivable thanks to comedy.
However, it's worth mentioning that there's a sub-plot about Hit-Girl giving up being Hit-Girl and trying to fit in at her school. Not only is this way out of character, but the decision comes about after a 20 second pep talk from her parental figure, who's opinion it's earlier established she cares little enough about to disobey him on the regular. This story line is drawn out and leads absolutely nowhere. We could have had 30 more minutes of Jim Carrey and his dog decimating bad guy's crotches while a giant Russian woman launches lawn mowers through police cruiser windshields, but instead somebody decided they needed to rip off "Mean Girls," of all things.