Lol, Pyro's aren't op. You just need to know how to counter them.
Nice joke. No, they're OP. I can take them out as literally every class I play, but that doesn't mean that they don't have the advantage 99.9% of the time.
Scouts aren't a counter to Pyro unless they're out in the open, which a good Pyro shouldn't be out in without team support because it's a close range class, Snipers are a counter again if the Pyro decides to run outside, but then again, they can be hit with the Flare Gun, essentially they can manage, it's not as much as a counter as it is a class that can kill it, like all the others. Heavies are a counter to some extent, however practically every encounter with a Heavy can be gotten away from with the airblast, Engie...yea no lol, Engie's not a counter to anything, I can kill a sentry as pretty much every class.