I don't know what was first, but pyro is one of my most-played classes. It might not be the most cunning and skillfull class, but it's better than playing the 5th sniper on the team.
I also play a lot of soldier and heavy, or medic if I'm feeling charitable.
EDIT: I've also played my good share of Demoman. That's /man/, not /knight/. And I have played a lot of engi and...
Well basically I just don't play sniper or spy. Real men fight their enemies face-to-face... or via an automated minigun turret...