What would your ideal MMOG be like?

SECRETS
My ideal MMO would be 100% single-player with the option of party play.

Depends on how they implement the secrets. But yeah, if they do it right, that's a really good idea, finding tons of new stuff at random that they never reported is fun. Can't be too essential to gameplay though, I've seen that done and the game died before people found the stuff years later.