I have played world of warcraft but i always give up after a month give or take. It just gets boring to me. I do try to buy the expansions cheap and play a bit more to explore all the new places. What i loved about the game was exploring and getting to places you shouldn't, like mount hyjal way back and that mountain on ironforge, or as a lvl 15 all the way from dun morogh to silithus (and then ported back to iron forge because apparently lvl 15 weren't allowed to that special event there ...)
as a game collector i've got quite a few MMORPG accounts. most of the games get boring because i have a hard time finding people i like to play with and real life friends are just as undedicated

i play lord of the rings online once in a while, but mines of moria bored me and now i rarely play.
i sometimes pop into second life.
i played anarchy online a bit long ago when it got free, maybe the account is still floating around.
i played tabula rasa when it got free to play up to its shutdown couple months later.
i played Archlord a tiny bit a long time after it became free up until it moved to the new service (europe problem. codemasters stopped the service here) i have also migrated to but not tried yet.
i play sometimes Guild Wars (all three campaigns), but it gets a bit lonely (and yet i hate the towns...)
i played Warhammer online, but it got boring too. but most awesomest collectors edition ever
still have the codes from Age of Conan and from City of Villains to register. Waiting for whenever i have time.
might seem like waste of money, but i do only buy games when i find them incredibly cheap, and these (mostly) definitely were

. also they look nice on a shelf.
i'd love to find people to play with, but i probably wouldn't fint the time to play consistently