How the f did they get rekt by a bunch of lightloving spacegoats? Sure we killed a good number of them during WoD, but before that the orcs killed a good number of draenei too. And I would think that with the weaponry the Iron Horde had, and if they started up the ol' foundry again, the draenei (what was left of them) wouldn't stand much of a chance. Even Durotan was apparently killed like a bitch, lol how?
It's nice that Blizzard wants to show "Hey the light can be bad too", but this wasn't really the place for it imo.