What is your favorite MMO?

I've only tried LOTRO, and was leery of getting sucked in and finding I spent way too much time with it. It probably does take too much of my time but I am managing it ok. I obviously can't compare it to anything, but what I don't like is that it doesn't compare well to itself. For every step forward it takes with new content releases, it takes a step backwards by "dumbing down" to please users who don't like to have to "work" for in-game rewards. Travel is made quicker and less expensive, resource gathering is made swifter and now foolproof by labeling everything, and a quest tracker does everything but point the way with neon signs - even though all the quests are already laid out with precision on a half dozen websites set up for that specific purpose. Kind of takes away from the point of it all if you don't need to really "lift a finger" to achieve anything.