Mark, I think "fact and fiction" is a little bit of a broad subject, since it encompasses basically everything. Everything! What isn't fact or fiction? There's also your added subjects you mention. A wiki ought to have an aim otherwise it's just a messy blog with categories.
You and your contributors have done so much work though! So much content, it's a bit of a shame the organisation is so lacking. There's also the fact true crime and fictional crime aren't separated, there doesn't seem, as far as I can see, to be any way to tell which is which when you're reading an article.
Anyway good stuff about Taxi Driver (fiction!), is what brought me here. The content is great but maybe you need to split it into a few smaller wikis, or else create firmer categories and make sure everything belongs to any relevant ones. Good luck with the wiki!