TBC Has been my favorite so far, after playing on beta I'm super excited for WoD though.
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Hands down, Burning Crusade because.. well.. Karazhan!And let's not forget the first time we walked through the dark portal and felt that sense of adventure outside of what had become our norm.
Burning Crusade was my fav all the way......!
Burning Crusade was my favorite, so many memories of questing in Hellfire, Zangar, and dying a bunch in Terrokar.
I liked Wrath.I already have WOD, but I want that plushie!
Wrath of the Lich KingMy first xpac, ICC was amazing, also blood dps :)
My favorite expansion is Mists of Pandaria. Pandas are by far my favorite race and their starting area is beautiful. Can't wait till Warlords of Draenor!
I liked The Burning Crusade the most. Seemed to strike a decent balance between challenge and rewards (even though attunements were hell!)
My favorite used to be Wrath of the Lich King, but the improved questing and art design of MoP has made this expansion the best in my opinion!
My favorite so far was wrath. the story and raids where the most interesting i came across, but i'm really looking forward to WoD, i've always been an orc at heart
Cataclysm but then again its when we came into the game. Anyone coming later missed being randomly killed my Deathwing when he would scorch an entire area you were questing in. Can't imagine all the cool stuff we missed in the earlier expansions.
Mists of Pandaria was my favorite expansion. Remember, even Lich King would never say no to panda.
TBC for story. Wrath for gameplay.
I think Wrath of the Lich King was my favorite, simply because of the sheer scope and amount of things to do.
cataclysm was my favorite expac. i started really raiding, and pvp was so much fun.
MoP was my favorite! I loved the Pandarens and the general aesthetics (I even loved the Dread Wastes, though I typically NOPE right away from bugs.)
TBC for sure, i start WoW with this freaking awesome expansion!
I am torn between Burning Crusades and Wrath. I love questing in Outlands, but the Tournament was fun too.
My favorite expansion was easily Wrath of the Lich King. It was the first one I really got into and tempted me into raiding on a weekly basis. My schedule has conflicted with raiding as often since then, but I'm still just as addicted to the game as ever!