Revolvers are balance breakers. All the guns had it's purposes, covering other weapons' weak part. making the game more fun and having to continuously change guns according to your situation. Making you adapt.

Rifle: mid range, fast bpm, general purpose.
Sniper: long range, low bpm, for sniping
Shotgun: close range, mid bpm, one shot kill in close range.

And there's this ♥♥♥♥♥♥♥♥♥♥♥♥

Revolver: close/mid range, mid bpm, one shot kill.

It's like a sniper but without the terrible acc unaimed and the bpm of a shotgun which is considerably faster than a sniper. And with it's high damage being able to one shot most people, it makes the rifle/shotgun borderline useless. Snipers being useful in situations only in long range. ♥♥♥♥ revolvers.

extra

bpm - bullets per minute

Shotguns might be useful in extreme close range where you cant aim well and with it's high spread being able to hit people even when they're at the very edge of the crosshair.

Rifles being useful to people who are not good at aiming or just going against a grapple master.

Even with these reasons they are still useless in front the revolver.

Summery: ♥♥♥♥ you, Revolver.