I have never played a MMO, but the thing I am concerned about is the kind of overall story that this could deliver. I loved the stories of both games (despite problems with the latter), and the epic feel of the games. I liked the character interactions and the immersion that the games allowed me to have in that universe. After playing other MP games, fun as they can be I have found they they make it hard to be immersed in that universe, because ultimately other real people are going to be doing things that I feel, rightly or wrongly, don't fit the universe. That is usually why I tend to favor SP games...