Pistol crit: 45 at any range.
Shotgun/Scattergun crit: 18 per pellet, 10 pellets, any range.
Minigun crit: 27 per boolet at any range. 40 boolet per second.
Sniper Rifle crit: Between 150 and 450.
Revolver crit: 120 at any range.
Rocket Launcher: 270 on direct hit.
Grenade Launcher: Up to 330 on direct hit.
Stickybomb Launcher: 353 at ground zero.
Syringe Gun: 30 per hard to aim syringe, 10 syringes per second.
Flamethrower: 19 per particle at closestmost range, decays down to 11 per particle. About 22 particles per second.
So, unless very close, even the MEDIC outdoes the Pyro with crits. Ever wondered why NOBODY Kritzs a Pyro? Because all other classes do that better.
Yeah, syringes do more damage per second than flamethrower - but the problem is, flamethrower is way easier to use (and has airblast). So yeah, if you're playing with Timbuktu's proest medic, and pyro with all sorts of mental disorders, it's better to kritz medic.