How is Pyro OP while Heavy is not?
I wish Pyro was OP, but coming from somebody who is practically pure pyro, it is not. I can't say I find any classes that I just always own, except Sniper and Spy. Depending on whether or not they know to run and shoot or try to fight me right up close, I can either get owned / own a Scout or Soldier. Medics are good as gone if they are healing, but if they're being combat medics I usually get killed. Demomen own me unless I sneak up, which isn't uncommon because they are a more stationary class. Heavy is just a bad idea to attack with Pyro in general, but if we are in a tunnel and I have Backburner, I can get them down regardless if I am behind. Engi is pretty defenseless as long as he has no sentry out. If he DOES, then I am avoiding that at all costs.