Before Crank 2 came out, I spent some time trying to defend my love of the first one to a friend of mine. I posited that it was somehow so nihilistic and cynical that it goes right out the other side and ends up oddly innocent.
This review of #2 makes the same point about the sequel (which, incredibly, I haven't yet seen):
And while it’s true that, if you isolate any single scene, the film is truly disgusting and reprehensible, taken in toto, there is a certain amount of … I don’t know if “innocence” is the right word, but close enough – innocence to it all. Or charm, maybe. The sum is less offensive than the parts. It’s just too damn stupid to be truly evil, too goofy and unhinged to truly offend.