"Crank 2" picks up from the moment "Crank" finished and follows the same furious, crazy, violent, highly-charged pattern of nonsense as the first one. Imagine all the action scenes from a normal movie have been cut together, and all the scenes about plot or mystery have been left out. That's what "Crank 2" is like. Not a minute goes by without somebody being shot or stabbed. It's relentless, and that's really what it's all about.
As well as some more violent and ridiculous moments (as if the helicopter fight at the end of the first film wasn't enough), there are also some very tongue-in-cheek moments that give it a bit of an extra dimension. The surreal bit in which Chev and one of the baddies turn into Godzilla style giant monsters- brilliant. The bit in which one of the incidental characters from the first film re-appears on a psychiatrist's couch, good fun. It's slightly "Austin Powers"-like in the way it twists off and goes very silly in parts. Except of course the gun-fighting, brutal violence and regular nudity is not quite so "Austin Powers"-y.
A very very silly film, but if you want a violent action movie with a sense of humour, this is one of the best (but watch the first "Crank" first).