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www.shizmoo.com has some of the most addictive multiplayer online games i've played.
I particularly enjoy sumo volleyball. But kung-fu chess is also very entertaining.
First, let me note that this is not an mmorpg. Sorry if i dissappointed you.
Second, most of you guys probably know about this, but regardless this is for those who don't (or to remind those who have forgotten).
Lastly, if you're questioning my motivation, I'm posting this because i have played sumo volleyball for several years and have witnessed a relatively stagnant player base (only 20-100 players online at all times). I wish more people would play--i believe that it is lack of awareness that contributes to the lack of players.
Try it out if you haven't; it's worth your time.