it's just the push, tbh. It pushes way too much, too often, too consistently. When you compare it to every other push gun in the game, it blows every one of the out of the water when you just compare their pushing mechanic. S.Bogen/J.Wheel pushes on every shot, but deals low damage, short range, and VERY slow projectile. Ingrid only pushes when they get close to Kuzmann. Sigh/Vortex only when the meter is full. Loaht is short range, only hits the floor.
Tolchok out-ranges, out-pushes, hitscans (the only push gun to do it... maybe Ingrid, but eh), requires no reload. Oh, and I never mentioned damage of any other weapon, but Tolchok out-damages them all. I'm actually fine with the damage though, that's the purpose of a minigun.... but being both the best gun at pushing and the most damaging, makes no sense.
In pvp, since it's hitscan, you know as soon as you have it pointed at you, your life is probably over and you won't be able to react at all, due to how pushing cancels all player actions.