I'm not exactly surprised about this. Beta access for Mists was a point of contention for players that expected their Annual Pass to grant them immediate access, only to find out that the invitations were being sent out in random waves. Of course everyone eventually got in, but it took time for it to happen. Having played in every beta since release, I have to say that the Mists beta was far, far more congested, and I don't know whether that really helped much on the feedback front. To a certain extent, it seemed like more players were actively dissatisfied and angry about bugs and errors that are, frankly, part and parcel with the beta experience. Bugs happen. Beta is where all those bugs are discovered and worked out -- that's what beta is for.