Actually, I don't really agree with this. Sure there are people who shotgun/melee but every-class has defense abilities against this. Double-jump, shields, warps, etc. If you're not a close quarters guy play with more skills. And if your armor is up you wont get a one-shot-death unless they are right on top of you. At that point, they could have meleed you from behind which should ALWAYS be a one-shot.