WotLK was by far my favorite MMO expansion, ever! Just barely beating out Velious and Kunark from the original EQ.

I loved the setting. I loved the storyline. Loved the main villain. I loved the difficulty level, and the ease of progression with each patch. Loved Wintergrasp, hated Ulduar. And to me, ICC was the perfect difficulty level for an end-game raiding zone. Getting that Lich King kill before the launch of Cataclysm (though I was not actually multiboxing at the time) was the greatest thrill and most exciting moment of my entire WoW experience to date.

I didnt start boxing until around when Ulduar came out, and didnt get my first team to 80 until ToC was out for a bit. I would love to go back and start boxing LK from the beginning.