would perfect dark improve from regenerating health? no
turok? no
half life? no
doom? no
resident evil? no
games that had health kits, made it seem much more real and immersive, sure it made things harder, but why not? alot of the fps's comming out are pitifully easy because of the health system.
personally, i would RATHER have to WORK to have full health by the boss fight. sure its irritating, but it also makes you flex your imagination; to think of how you could have handled the previous situation better and learn from it.
another plus to health kits. on games like MW2 on harder difficulties, its near impossible to guage how much damage a single bullet does to you. will it kill in one shot? can i take a few so i can rush and cover?
i mean. hell goldeneye (no the remake is dead to me) was one of the golden moments in fps history, and it had neither health system. you run outta hp? sucks to be you