3) Not Doomish? It is Doomish!
No, it's not Doomish, or at least a visor certainly isn't. Just a helmet would be okay, I guess, but the problem is that even the smallest possible armor value (1) is as big as a whole suit of green armor. A helmet, then, shouldn't drop until red armor is commonplace.
Let's keep in mind that you're a marine, not some computer-enhanced gizmo-wielding JC Denton. I'd like to see the game refine & balance its core gameplay
(nerf cacodemons & hurtfloors)
instead of adding in gimmick items that can do as much as whole traits.