I wouldn't say this kinkmeme has the worst. I've definitely seen a lot worse, like a lot way worse. So, I think the worst is crazy hyperbole.
As for a nice one the SNK kinkmeme was pretty nice. I haven't visited in a bit, but I use to be there all the time, and it was just a haven of brilliant prompts and stories, and pretty nice people.
I think the APH one was nice, however I never went in the discussion section, and I can see that part getting crazy and being not so nice.