I love it. MMPORGS have never been able to capture me, and this one has me enthralled.
It was able to grab me because the options you have to choose for your character in the very beginning are minimal, unlike most games like this where you have to decide a million options when you barely know how attributes like "Mind" are going to affect anything you do. In WoW, all special talents are chosen as you go along (and there are loads), while most attributes mean something to me.
(I haven't played CoH, so it may be similar.)
I also like the Warcraft universe, and know some of the recent backstory and how different races interweave. So that helps a lot.
