I've been using the Dragon's Fury a shit ton lately, and goddamn it's so fucking fun. There's not a big reason to use it while flamethrowers continue to have flail-mode enabled, other than flexing your Pyro muscles hard as fuck on the enemy team. For real, you can airshot the fuck out of people with it, got a fuckin triple airshot yesterday. That alone makes this weapon instantly more fun than the flamethrower in my eyes. If it didn't have knockback, a big skill-factor of it would definitely be gone. It's by far the best sidegrade added to the game since the Kritzkrieg.
-Finally moves away from Flare crit gimmicks.
-Airblast takes skill and can't be spammed, but at the same time, the weapon is countered by airblast since you can't afford to not try and follow up on a shot.
-Airblast also can't be used immediately after attacking.
-As aforementioned, has knockback and can airshot, both of which add massive depth to the weapon.
-Punishes missing and hesitating, rewards good tracking and prediction.
-Fuckin big ass range lets you zone more like you were using a Grenade Launcher, and counters W+M1. Gives you options other than "get close to enemy."
-The afterburn is short enough so that if you miss, it goes away. No room for error.
-Deals full damage to buildings, whether intentional or not, lets you destroy bad Sentry spots.
-Mediocre at Spychecking.
The TFTeam pretty much nailed this weapon right out the gate. Should've been stock from the very beginning. Only things I would change are making the projectile hitbox slightly smaller and fixing the projectile instantly colliding around special map geometry and certain slopes.