It seems to me that there's a genre I've been largely ignoring. Let's call it the 'cast list' or something like that. It's simply where somebody imagines who would play whom in a movie made about their favorite characters. This happened before the internet, but the ease with which anybody with access can put together their ideas with pictures, etc., has made the internet the prime medium for this genre.
Superman gets this treatment a lot. There's comic book movie. comic book movie again. there's mtv. comic book movie again.
People feel entitled to a good Superman movie. They put their demands up on the internet. Because of the recent rumor that Christopher Nolan is to be involved in the new film, they write long, long letters and debates about how or why he should be involved.