I've played a lot of MMO's, and when I played the WoW open beta, I remember thinking how different it was from every MMO before it in the fact that it was stable, balanced, and pretty much ready to go. Sure, after launch they had issues with too many players and not enough servers, but overall it was a very stable launch. I haven't seen a lot of games manage that. WAR was really rough for me, I loved the game, but it crashed like crazy.