On one hand, to have a game live up to expectations is almost a foolish wish in this genre; we are let down too often to really expect that everything will be as glorious and perfect as the press releases -- and our imaginations -- make it out to be. If an MMO managed to hit most or all of those expectations, and perhaps even exceed them, it would be a glorious day indeed.
On the other hand, it's fun being surprised. There are so many MMOs in development that it's fiendishly difficult to track them all, and odds are that a gem will slip past your radar sooner or later, hit release, and make you cry out, "Where have you BEEN all my life?"
So which is it: Would you rather have an upcoming MMO live up to expectations, or be completely surprised by a terrific hit that blind sides you?