Guess you have never been in a rocket launcher fight and watched people continue to shoot the ground under you because you suddenly stop? Guess you have never witnessed how amazing it is to be able to just sit in mid air and destroy the -blam!- out of everything when airborn is on (or the one where you do more damage, not take). Yeah it's not the best exotic, but they are leaving a lot behind so perhaps it will be one of the more useful ones in the right situation.