In the grand scheme of things? I'd have to go with The Burning Crusade :) Not specifically because I liked the changes that were made to the game at that point, but also the things I experienced in wow during that timeframe ^^ I also really enjoyed the Outland continent as a whole - So much variation!
The Burning Crusade!
Mists of Pandaria. I love how the expansion started as the arrival into a continent full of friendly inhabitants and over time turned into something so grim because of Garrosh's lust for power.
My favorite expansion.. was probably Burning Crusade.That's all I have to do..? All right, then.
My favorite expansion is Mists of Pandaria. Everything about it was good! Except for the daily quests.
Mists of Pandaria, it's where I started.
Definitely Burning Crusade for me, everything was all so new. The grinds in that expansion were actually fun. Pumped for WoD because its BC all over again :D (at least the areas lol)
The burning crusade
BC was my favorite expansion mostly because it had some of the best zones in the game at the time and brought forth unique opportunities to every.
I liked all of them, but WotLK is probably my favorite.
I would choose Mists of Pandaria! I love the The Tillers and the The Anglers. The music and scenery are both really top notch in this expansion.
Wrath of the lich king was the best for me. loved the story and overall feel of that whole expansion. i still spend quality time there now :)
WOTLK becasue i start raiding in that expansion :)
My favourite WoW expac was Wrath of the Lich King. Most cohesive story, art direction, and world building I've ever seen. Plus, Arthas has been the only villain that legit made me scared...
I like every one of the expansion..something new in each..but I think Lich King was my favorite
I think it's WotLK ; i loved everything , the music , the zones , quests were awesome and i felt goosebumps when playing !
Without question Wrath of the Lich King. very heavy Lorewise, with the most beautiful raid ever : Ulduar. beside it was the first time i really had much time to play, which kinda served my experience.
My favorite expansion is mist of pandaria because i love the asian style :3
Old Burning Crusade is my favorite expansion so far; shamans on the Alliance and paladins on the Horde. It was right when I started playing, so I have several fond memories; from the loading screen, to raids.
Mist of Pandaria. I love all the new content never before offered by woW. Like the farming and cooking. Plus all the new mounts and pets!