While I agree there is a lot of really bad fic at FFN, there is honestly a lot of good stuff there too, but you have to weed through things to find it. And I love TPP and ASH, but sometimes the moderated sites are a little too much so for my tastes. (Having a multi-chaptered story that takes a month or more for each chapter to go through the queue, means it might take a couple years to get a longer story posted). That is a reason I am liking AO3, but I will admit that I don't get as many comments on my stories there as the other sites.