The first Batman movie (that I can remember, anyway) and the most recent Batman movie are the only ones worth watching. The rest suck. The Superman movie's are crap, too.

Spider-Man (Spider-Man 2's worth seeing once...maybe), X-Men, X-2, Blade, Daredevil...all are worth seeing. The Hulk was crap, and I haven't seen Fantastic Four or The Punisher yet.