I actually didn't mind it.
I thought Yor'sahj was really interesting, and didn't mind Hagara either. I also can appreciate the attempt at least having us fight on Deathwing's back, even if it wasn't as successful as it could have been.
As for Madness? I again love the idea of it, but felt like doing the same/similar things on each platform and just hopping one to another wasn't as successful as it could have otherwise been.