This is the only MMO that I keep coming back to...
Mostly because I'm fascinated by Star Wars, and the class stories (which is weird because I usually like gameplay more then the Story in most games). Love being able to dress up my character as well as their companions, love how many alts we can get as well.
Love that the class stories can be repeated (my characters are usually more complicated then simple light and dark).
Love the Legacy system, as well as how cheap the game can be. I also haven't even come close to completing the expansions (my most advanced character still hasn't began Iokath).
…Just so much to work on and do!