The closest I've done to MMORPGs has been some collaborations with fanfic (creating a "virtual season") and a play-by-blog called
DC Nation (I play Green Arron II, Starfire, and an OC)
I have not been terribly interested in MMOs, as I work in IT and see what amazing time-wasters they can be for my colleagues. the reason I'm bothering with this one? Well, despite my annoyance over Revan and Exile's
unexplained, red-shirt deaths, I'll swallow it because the Bioware writers have a great track record of knowing what the hell they're doing.