The Daily Grind: What was the best WoW expansion

Last November, Massively is sister site WoW Insider posed this very simple question to its readers: What was your favorite World of Warcraft expansion? Buy Power Leveling. Wrath of the Lich King took over half the vote, with Burning Crusade trailing far behind, which surprised me. I d consider Wrath to have been the game is peak myself, but I always assumed TBC would beat it in a straight-up poll. But maybe the difference here is that WoW Insider is fanbase is made up mostly of current players, whereas on Massively we are catering to more of a pre-and-post-WoW community. So today, we are asking you: What was the best WoW expansion?