Don't complain about the Pyro and suggest having him nerfed:
Pyro is a crowd-control class, and made for offense. It is his job to be strong, just like the Soldier. The hard part about using Pyro is trying to get close enough to the enemy.
"But flare guns!"
Yes, but the projectile can be easily dodged. Even if you get hit, you can still deal more damage with your longer ranged weapons. One bad class to use against a Pyro is a Scout or Spy. If you use other classes such as Sniper or Heavy, you have the upper hand because you do more damage than a Pyro at a distance. In a closed map? Use Pyro, too. If you do that, it's a fair match, unless he's a more skilled Pyro. If so, Heavy + Huo Long Heater can easily sweep that Pyro in the Turbine ducts.
TL;DR You probably knew all of this, but still, stop whining. Pyro is just as balanced as any class.
Now, time to sleep.