Hello.
Pistol is useless in game.You need to hit 1/2 of magazine to kill enemy at 2 meters at you.And there is no special advantages of this weapon.This is useless piece of metal.
But pistol doesn't worry me a lot,soon there will be submachine guns,uses same kind of ammo.Also will be another failed class of weapon.

IRL 9mm have one advantage to rifle round - their stopping power,hitting of that round into the vest may be not lethal,but make very heavy pain(If there was no ceramic plate).Yes,they cannot penetrate vest like rifle round.Yes,they cannot fly so much long that 200 meters.

I thing hitting by 9mm round must have negative effect,like small risign up weapon,that dissallow you aiming,or increase if fatigue.Or even both.