The best comic book series I ever read was Watchmen. Now the movie of it is about to come out. I agree with everything that Boston Globe movie critic Ty Burr says about his own sense of anticipation.
http://www.boston.com/ae/movies/blog/2009/02/the_watchmen_wa.html
I thought 300 was one of the worst movies I’d ever seen. I scanned through most of it on DVD. Something I’m worried about for a general audience is that a full appreciation of Watchmen requires a vast knowledge of the history of comic books and their creators. Everybody knows Batman, but almost nobody knows that Dr. Manhattan was adapted from Captain Atom, and Rorschach is based on the work of Steve Ditko.