It was horrible because of the new players invited in Beta. It caused lag throughout the day with a couple of server restarts. However with all the lag I managed to make a Death Knight and did a few quests. One part I found eerie but great was when the Lich King constantly whispers you to “Kill or be Killed” when you were killing civilians. It was great.
Overall I like what I see, I just hope the lag will correct itself.