'I have to disagree with you on Constantine- while the movie wasnt bad, it completely bastardized Alan Moore's real intentions. In Constantine, he is a catholic, but in the comic (Hellblazer) he is a neutral figure who tries to keep balance and not let heaven nor hell take too much influence on earth. Also, religion is not limited to the catholic faith, but all religions co-exist.
I might add, there is no way Keanu Reeves looks like Sting.
V for Vendetta however, I though was very good even though it was not directly truly faithful.
However, one should not try to point out which part of the story the current comic-based movie- while some (like Vendetta above, or X2) follows it to some degree, most movies are just loosely based on the storylines.
*Goes back to his own manga writing*