I will say that the Doom example -- where the last bit of health is counted as more as the rest of your health bar combined -- doesn't come as a surprise for me

I will say that the Doom example -- where the last bit of health is counted as more as the rest of your health bar combined -- doesn't come as a surprise for me as I did feel that I could get away with just charging into the fray and dancing around all the enemies and my health bar would drop super quick but then somehow I was able to not lose that last bit of health as I'm charging through everything or running away from everything to find some brief cover before coming back in. The game really wants you to charge and meleeing the weakened enemies to death (as a melee kill is the only way you will get health or ammo back, as it springs out of them), so they pretty much have to do something to help you make that otherwise suicidal charge. Even knowing this, I don't care, I still think it gives you an awesome feeling. In fact now that I know this for a fact, I will probably get even more reckless in the game.