CthuluIsSpy
Arcane
The guns in Doom2016 do sound weak imo.
It depends. For a Doom game, the shotgun is pretty crap, but the Heavy Assault Rifle and the Plasma rifle feel great. The HAR even feels and sounds better than the chaingun, especially if you use micro missiles.
A lot of the weapons' damage and features actually come from their mods, and I noticed that you seem to deal more damage with upgraded weapons than non-upgraded weapons.