Honestly this game was bad, there is no excuse, this game was AWFUL.
The only redeeming feature is playable Goblins and Worgen, but the lore was terrible, so painfully star wars-esque and completely disregarded the previous storylines, and ignored the consistency of the plot entirely.
The antagonist was a joke, derp a dragon of dumbness wants to destroy the world, because plot armor. I could not be more offended at how much disregard was given to the lore to make this character and this storyline.
It was terrible, its awful and quite frankly, its only purpose is to serve as a transition to MOP, which is only just better for its better written story, despite the fact it effectively destroyed the MMO itself.
I honestly hated every expansion to wow for making the lore more and more ignored in favor of giving players epic loot and killing bosses that in realistic terms would flat out annihilate them. This was the worst culprit by far, with no exposition as to how you became strong enough to kill a primal dragon, and no explanation as to how you are suddenly the guardians of the world that is now threatened by the old gods...
Seriously, for people that actually respected the lore of Warcraft 3, this game will bring you to tears at how awful it was.