I'm going to go with any number of lesser-known MMOs, including Perfect World, Rising Force, Lineage 2, Ragnarok Online, Ultima Online, and probably a few others.
Pardons go out to City of Heroes, Asheron's Call, and Atlantica, because they had good gameplay and inventive worlds that could be explored, as well as an actual connecting story (though it relied on comic-book logic for CoH, but that kinda makes sense, given the setting).
Attention Deficit awards go out to WoW and Eve because I couldn't care enough to play them and see if they were boring (though my roommate did play Eve for a couple months and was convinced it is physically impossible for any real human to enjoy it).