if the next expansion deals with the old gods they better make Shadow priest god tier the entire time! Which means we'll be shit. Speaking of, and I know everyone was talking about some of the things that they really enjoyed in this game, but for me it was surrender I can't think of another ability or class that I've ever played that I had as much fun as I had playing that style. The payoff magnified it but it even made Farm content extremely enjoyable because you always had that waiting for you.
Outside of that I've had a lot of fun playing this game but the things I remember most were things that I felt like I achieved something. Which is probably very strange considering it's a video game. During burning Crusade I remember feeling really satisfied after I formed all of the materials to make the crafted gear for casters finally getting certain bosses down (gruul, leo, vashj, kael, archi, Illidan) I quit mid Lich King and Pandaria is the one that I really feel like I missed the most on