Tips on making FPS more realistic?

Hi there!
What you consider adding a FPS game to make it more realistic? E.g.: background sounds, player get tired if running after a while, lights, player can not jump repeatedly, etc.

lol Player actually acts like a bullet hit him. I've never seen a man shoot who keeps running around after... Lol 20 bullets to kill a man, please...

its true, in real life you die in 2 , 3 shoots maybe

I think with Superku's hitzone, some great modeling and animation and some top notch fxs. You could create a close quarters fps that is extremely violent and realistic. With 3dgs using a lowered poly set could allow a mix of cartoon like and super real fps action. You'r other suggests are also great for this.