Granted, something people forget about that engagement is that the only reason the air fleet was attacked was because there was a Twilight agent helping plan the expedition and knew where and when to set up an ambush. And if not for that Twilight ambush then Garrosh’s decision would have given the Horde nigh-uncontested control of half the zone by eliminating the Alliance, who went on to give much-needed aid to the Wildhammers.
It was a tactical gamble, and he just happened to be given loaded dice that rolled him snake eyes.