To be honest, The Burning Crusade is one of the most solid expansion packs I have ever seen for any game. While you may find a few bugs here and there, it's a thoroughly polished package. It simply delivers where many don't, and it's easy to see why its already having so much success. In fact, the first day sales were roughly 2.4 million. With this much anticipation, it's amazing to see something that actually delivers on the hype.