Well when it's me airblasting, it's always good. And you can ALWAYS play MvM with us. We do it very frequently, between 4-6 when we queue.There are usually more reliable options for Pyro than airblasting, but airblasting is not necessarily bad in of itself. It just may get annoying to some players because it messes with their aim.
Regardless, the person who griefed your game has no excuse whatsoever for his behavior and should rethink his actions.
Unfortunately, I do not have anyone to play with in MvM. I just play solo in a team of randoms and try to do my best to help them.