For a completely different MMO experience try urban dead: http://www.urbandead.com/ Its a very low tech text based game, set in the zombie apocalypse, you can play it as either a human survivor and a zombie, and run around the city. You have a limited amount of actions you can do, capped at 50, and you get 1 extra action every half hour, so it avoids the whole addiction aspect of MMOs. I like it, although some people might find it boring.
At the moment the zombies have ransacked three quarters of the city, I have no clue how they did it (about 2 weeks ago the game was 39% zombies, 61% survivors, now its 51% zombies, they're kicking ass) It can be slow to start it, but once you gain a few levels performing actions becomes a lot easier, you can also join one of the many clans, and try to work in teams.