Alternates between quiet, surprisingly dull scenes in which the hero and the girl talk in that italicized comic-book way about his past and orgies of computer pixels dressed up as gibbering fiends.
The actor's black-on-white getup makes it plain that Constantine is one 'whoa' away from Neo-dom, and that Constantine likely represents the start of another Hollywood franchise with diminishing returns in its future.
Constantine deals, at least in part, with its title character's attempt to cross over from hell to heaven. But there's no uncertainty about the movie's fate. It quickly heads south.
Takes itself just seriously enough to put on a good show. Reeves earns some theatrical redemption, the demons put a scare into the waywardly righteous, and there are plenty of evil-duders left over for a sequel.