Poker Host for some reason I can't stand being in their rooms. I've stopped playing there alltogether because I find myself going all in with crap cards just to get out. It's odd but it's horrible in there.
This room isn't on you list but I can't stand the avatars at Full Tilt. I also don't get those little pedestals all of them are on. I literally can't stand that place and it's primarily because of the graphics!