So. I recently encountered a Pyro who literally played the class with skill. The motherfucker could kill you without you even touching him. He could reflect 90% of the explosives that we sent at him, though I nailed him once with my Loch'n'Load. All of his kills were either Flare or Axtinguisher kills, and he used Degreaser as his primary.
He'd light you up with his flamethrower, swap to Flaregun, start pelting you, then if he managed to back you into a corner, he'd start airblasting you until he could get close enough to finish you off with Axtinguisher. Annoying, and literally the best player on their team, if his score counted for anything.