I'm currently playing on Frostwolf, one of Warmane's realm. It's a 5.4.8 Mist of Pandaria expansion and it's kind of decent. I have encountered a few minor bugs on quests. One thing I hate though is that some of the Burning Crusade and pre-BC dungeons are locked. Probably not well-scripted. But they have a good working Dungeon and Raid Finder. If you have some recommendations, I'd love to check them out. Cheers!