I was a huge fan of WoW until the South Park episode ruined it for me. I Saw the drastic transformation in it after the episode launched. The maturity level took a major dive and the trade channel turned into a public chat channel. (not to say that it wasn't that way before, but it got a lot worse after south park.) I'm currently searching for a less known MMORPG that will restore my faith that mature gamers are still out there.
All of them suck now. WoW is just doing quest and getting new stuff. Runscape is also quests. Pretty much all MMORPGs are Quests. I quited today on MMORPG.