Helz: But I haven't touched
SC2 or Diablo 3, and unless hell freezes over and they actually take away all that crappy DRM, I never will.
Smart move. My curiosity in how the story in SC continues got the better of me, and I bought SC2 despite my dislike of the DRM. Well, it wasn't worth it. There is so much wrong with the story, it's not even funny. The worst part to me, however, are all the retcons. Especially the change to the origin of the Zerg. Heck, I haven't even finished HotS yet, because my PSU died on me after I returned from Zerus. I guess, it didn't want to continue the suffering either.
To make it short (and extremely simplified), SC2 is a remake of WC3, with the Zerg in the role of the Orcs, and Kerrigan as a mix between Arthas and Thrall.