I think ALL fan-forums are the pits.
MadonnaNation for reasons explained. Kylie's fan forum SayHey isn't any better although it's much less vicious towards other artists. SayHey is literally thread after thread about how much Kylie is a flop and why it can't be 2001 all over again

Exhale is a delusional, delusional mess. I think the members there are on the same stuff Britney was on back in 2007. GagaDaily seems fine surprisingly from what I've lurked and seen. Same with The Beyhive EXCEPT that thread they have about Rihanna.

Lord have mercy...