Which heavy weapon in game can have silencer?
You get exactly the same damage because because bonus is applied per shot, which means that with high fire rate, more shots gets sneak bonus and thus your entire DPS multiplies. As long as you stay hidden.
But then again, if you are using Minigun for silent kills, you are doing it wrong.
I don't use VATS at all, so I can't really argue with you. But I ques the same is valid for every heavy weapon ...cons they all are heavy after all.
Heavy Guner perk increase damage just like any other weapon perks do. That counts as benefit for shooting to me. Only few weapons in game benefit from more then 1 weapon specific perk. I recall only rocket launcher.
As for silenced weapons, Do you really complain that Minigun should have silencer mod?
I will repeat myself, but if you use Minigun for sniping, you are doing it wrong.
You get the same sneak attack bonus as for any other weapon. All perks apply to Minigun equally. You continue to focus on single shot damage and disregard fire rate.
I am not sure criticals work other then it VATS at all. So far I did not see any conclusive evidence that they exist outside the VATS.
That different weapons serve different purposes and that you can't snipe with Minigun as effectively as with sniper rifle or that Minigun is not as effective in silent killing as silenced pistol is not broken mechanic.