I am a Buffy fan (as well as all TV that is Joss). When "Buffy Season 8" and "Angel After the Fall" went to print, I bought them eagerly and continued for a dozen or so runs. I did, however, have to stop. It was obvious that the story had devolved into fan fiction.
I know ho weird that sounds! I know that Joss had a very heavy hand. In fact he had more influence than he did on the shows themselves, but that might be the problem. Could it be that the collaborative process a creator must go through moderates his desire to dote on his creation? Could it be that Joss should not be the sole creator of the whole story? I think so.
I am reminded of Star Wars. When Lucas had little influence, he made a solid trilogy. He came back with the sole omnipotence, and made a trilogy that was at least very inferior. I am beginning to believe that some stories (or at least some storytellers) need a moderator or score to make things not suck. Comics do not provide that like television, and television appears to attract creators who need it.