Favorite Online RPG

What is your favorite MMORPG? And why?

Me: Final Fantasy XI - very indepth, feels like it has it's own world. When you do something you get a feeling of accomplishment.

Runescape is quite fun. At levels 110+, there's lots of things to do... PvP is fun and rewarding, and there are lots of high level dungeons which require groups of well-coordinated veteran players in order to get through them. There's so much variety in the game and it's really great overall, but is overlooked by many people simply because it has mediocre graphics.