I thought Iron Man was pretty good.
I think the real reason comic book movies are coming in now is that CGI these days allows them to show all the effects as they want to. Most of those hero movies in the 70's were pretty lame by comparison. Of course, the downside of CGI is making the movies feel completely unreal.
I agree on Hollywood's general lack of creativity. Comic book stories come with ready made plots and storylines for the first movie and sequels.