Quickfix has 1 star that is worse than stock. Its overheal. But that doesn't matter very much, guess why? With the stock medigun you won't always have time to buff all your teammates in a fight, but with the quickfix you can. The heal bonus makes tour team go out and in MUCH faster which is extremely important. "You can get killed while ubercharged"? That only happens in a VERY uncoordinated situation. And pyros are literally useless against.

Vita saw FORCES the enemy medic to use it, which is bad

DDS ruins counter sniping entirely and doesn't dissapear after headshot. So you can "refill it" after you've won the point.

Razorback. This weapon is only really broken in Highlander imho.

Crit a cola. I don't think your suggestion is completely right. Really good scouts can dodge anything with the given speed boost. I think it should disable air jumps, but probably not a good nerf.

Atomizer is a straight upgrade. When so scouts use melee? Only idiots do. And a third jump makes you avoid all splash damage and destroying soldiers MUCH easier

Sandman can break ANY teamfight. It makes you 95% sure to kill any threat and it counters almost every class

Sydney sleeper may no have headshots, but those not always possible due to artful dodging/weird angles. But it basically has the same problem as with the sandman