I think there's a great playground of characters ideas and universes that a good writer could do fantastic work with (you only have to read Unity by Chuck who does the Opinionated Star Trek Guides to see that) but most people either write about their slash fantasies or rehash stuff from the source material, or have stupid crossovers that are just there for X meets Y and that in itself is cool.
If there was a definitive list of genuinely good FanFic I'd be more open to it but I'm not wading through all the shit there is out there.
If there was a definitive list of genuinely good FanFic I'd be more open to it but I'm not wading through all the shit there is out there.