After the slight disappointment of Wrath of the Lich King and The Cataclysm I was quite suspicious about Mists of Pandaria. I've played Warcraft 3 and I remember some of the Pandaren lore, but they seemed like a strange choise for a whole new expansion.
I was wrong.
MoP brings so much more to the world for us to explore: a new continent, race, class, pet battles and challenge mode dungeons and scenarios and there's more coming all the time. Blizzard has made it again: they've breathed new life into WoW and made me their humble costumer again!