His elite cast of shadow pandaren lacked meaningful presence throughout the expansion aside from Townlong Steppes, we did pretty much all the cleaning up by ourselves, not sure why he's always complaining about everything, even in Siege.
He should thank us for cleaning his entire continent of all the crap hidden beneath it. All he lost was the beauty of his vale, and even that he'll get back now that we cleansed the waters beneath it.
I mean if THEY busted into the rest of Azeroth and were suddenly faced with dragons, Lich Kings and all this crap we've been facing, I wonder what good they would have been to us. We messed up and cleaned up.