The same sort of thing in wrath. "The king of the undead threatens to kill everyone and turn them into his undead slaves! I will fight for my freedom!" as well as Yogg. "Another of the old gods, one of the purest forms of evil of this world surfaces and must be slain!"
It started to falter slightly in Cata up until the actual fight with Deathwing. I was excited to kill the dragon that had a burning hatred for the world, but not so much his followers.
In MOP, I really just can't get into it. The sha I can SLIGHTLY get behind, since they are the essence of another old god. The horde alliance conflict is also something I enjoy seeing as that's the basics of WOW in general. But the thunder king, I really cannot force myself to care about. It's just sort of a generic boss feel for me. I don't really feel he is connected to the WOW lore. Other patch bosses tend to be linked somewhat to lore but the thunder king is just sort of there.
What are your opinions? Agree? Disagree? Why?