That's what I support.

I'm not going to just read something BECAUSE its yaoi or yuri. I like my fanfictions to be well written, and make sense. It can be hetero, yaoi, or yuri, as long as it's good. I really hate it when people just make a crack pairing that makes no sense (and then they don't even try to make it make sense) and write a bunch of grammatically flawed sentences then expect everyone to love it just because its yaoi or yuri.
I've read fanfics with some crazy pairings in them, but the writer actually made it seem reasonable and, shock shock surprise surprise, they actually took the time to write it well!!!

Things I hate in fanfics:
Changing tense (generally I'm not a fan of present tense anyways, but I hate it more when people keep changing it)
Bad grammar (Don't even get me started)
Inconsistent fonts (seriously, if there's no reason to change the font then don't switch it in the middle of the paragraph)
Generic descriptions ('sexy' should be banned from the list of adjectives)

That's only the tip of the iceberg

I know there are some people out there that feel the same way, just trying to figure out how to say it.