It was more certainly Wrath of the Lich King, the expansion that I had my first max level character in. ICC was also the best raid in all of WoW.
The Burning Crusade! :)
My favorite expansion was Mists of Pandaria, simply because I hit my stride with an awesome raiding guild.
While I'm presuming most people will say TBC or WotLK, Cata was my personal favourite, revisiting old areas and seeing how they evolved was a treat.
Wrath of the lich king is easily my favourite.The quests and art were and are amazing. Need i say more?
The Burning Crusade, yes I have to say that. I'm not saying I wish it were exactly that way again, but I do have some very fond memories of that expac (also when I first started. c:)
Wrath of the Lich King was my favorite expansion.
MoP as a whole was my favorite expansion, it has a sense of mysteriousness that is set against a background of beautiful imagery.
Wrath of the Lich King porque en ese punto del juego el WOW era unico y sin duda para mi fue la mejor expansion porque siempre eh querido enfrentarme a Arthas y lo HICE ! XDDD yo y mi guild le pateamos el culo al muy cabron XD, Ok en cuanto al juego osea en expansion me gusto mucho porque pude explorar rasganorte mejor dicho recorri todo rasganorte, y yo creo q en esta expansion el WOW era para puro viciarse y olvidarse de los problems de tu dia a dia.
MoP was excellant
My favorite expansion was definitely Wrath of the Lich King.The zones were beautiful, the content was fun, the lore was interesting (I had never cared before then) and I met some of my best friends during that expansion.
Burning Crusade by far the best.
My favorite World of Warcraft expansion so far has been Cataclysm. I love the Goblins so much! I need WoD :)
Wrath of the Lich King was my favorite expansión:the story really hooks you is very interesting transformation of the son of the king to the lich King ^^
Wrath of the Lich King was my favorite expansion because I am a wrath baby. It was all new to me and I wanted to do it all. Shadow priests were amazing and I would love to see them make a come back!
Favorite Xpack would have to me MoP to me... strangely enough! This is where I learned to enjoy pvp and took the time to really push my character more.
My favorite was during WotLK, before the advent of LFG. Awesome times, still had community in the realms back then.
The Burning Crusade was my fav.
I'd have to go with lich king myself. The atmosphere was perfect.
Wrath of the Lich King was the best expansion. Tanking, healing, and DPS were all enjoyable to an extent. Now nothing is balanced quite right.