I'm not sure I would agree with you there. I suspect these movies are far more movie than comic book, and that the target audience is far more moviegoer than comic book fan. If anything, I think being a big comic book fan could actually be a detriment for such a filmmaker, as they would have to resist doing things that work for comic books/comic book fans but don't really work for movies/moviegoers. But more likely, if it is a good filmmaker, whether they like comic books will have little or no impact on whether they can make a good film, even if it is based on a comic book. The mediums are just too different.