Some of it's *awful*. Mind-numbingly, brain-breakingly bad. But some of it is so good you wish that the writers of the show/book/whatever had that sort of creativity. Have you ever read The Candle That Burns The Brightest (http://community.livejournal.com/dwfiction/35584.html?style=mine) for Doctor Who? It's the story they would have written in The Parting of the Ways if they'd had enough time.

*shrugs* slash is just the same as wanting to pair any two other characters because you think they'd be good together. Some of it is born because of a lack of female characters, some of it comes from the equation of hot + hot = double hot, and some of it's just weird.

If you think that's odd try Harry Potter, where every possible (and I do mean every possibly, up to and including the giant squid) has a 'ship and support group. It's all just fun really. :)