Loved the new races, they provided so much replay value. Loved the re-done leveling, again, made it so easy to get one of every class through what was then completely new content. It was like it was WoW 2. Everything was up to date. Loved the new zones, the initial raids, troll dungeons.
I only hated Dragon Soul and Abyssal Maw being canceled. Cataclysm turned me into the kind of player I am today, an altholic, jack of all trades, master of none as my GM once said. That's Cataclysm's legacy for me.
That's why I voted for 1-60 revamp.