This fable about a surly superhero rehabilitated by a nice P.R. guy (Jason Bateman) and his skeptical wife (Charlize Theron) tries to be many things at once — edgy, funny, twisty, sweet, poignant — and ends up less than satisfying on all counts. But it is also, and mainly, a Will Smith movie, which for his vast audience renders irrelevant our mark: C+