To my mind, there are only a handful of undisputed successes in Cataclysm. One of them is the new levelling experience. I've always been a quester/leveller by nature, enjoying that more than the endgame. Cataclysm has only exaggerated that. In fact, since Leafy hit 85, I've found it pretty hard to deveote much time to her and the various chores (and I mean chores) of the endgame.
The main beneficiary of this has been Halesworthy, my worgen druid. He's feral-specced, so feels completely different to Leafy to play. I charged through the worgen starting area, which is just wonderful, and found myself sucked ever onwards by the narratives of each zone. The "go to a zone, do stuff, move on" feel of vanilla has been replaced by driving (and often phased) plotlines in each major zone. It's fun, dammit, and adds another element of addiction to an already pretty compelling game.
I've started a little video series capturing some of the fun moments of the levelling experience. This probably covers Halesworthy up to his late 20s:
Halesworthy has mainly been following Leafy's footsteps through Kalimdor, as I wanted to see how much that experience changed. I can't wait to get started on another character and take them through the Eastern Kingdoms.
And as for Ularia, my space goat pally, who was labouring through Ashenvale waaaay back in May 2008, over three years ago?
Well, one ding…
So, yes, Cataclysm levelling rocks. Pity not a huge amount else does.