I hated the ending. Especially after epic cutscenes like jumping onto Deathwing's back spec-ops style. The dragons are spent bit felt alright, but who wants to hear about a baby shower after EPIC DRAGON-SLAYING!!! Anything would have been better. Perhaps some cinematic shots of creatures around the world sensing the maelstrom was over? Watching at least one of the aspects mortally wounded and die as a result of the epic battle we just fought? A prediction that would have greater effect upon Azeroth than a stupid baby, maybe?
(Lich-king had a really nice twist ending.)
But I guess you can only ramp up THE-EVEN-MORE-INCREDIBLE-POWERFUL-THREAT so many times. That's the only way I could imagine would make sense to set the stage for Enter the Fuzzy Pandas...