Like said before; play PC games. It avoids alot of such "implentations"
On 1-shot dead; Bad, bad... What fun would it be if you are supposed to be a soldier, and have to fight 100 enemy soldiers and die if they get one shot on you.
This method only works if there are VERY few enemies, and that is not the case in most FPS.
Play some random online-FPS where the balance sucks so badly that a machinegun takes 8 shots to kill and a sniper shot kills somebody in 1 kill. Fun being a machinegunner then. NO...
On Normal; this level should be for the "avarage gamer", not the newbie to the genre. Make it a chalange on alot of points (but not everywhere), but don't make it so
1) Only Fatal1ty can beat it
2) Anybody who appears (every game) in the top 1/3 of a online-FPS shooter can breeze through it...
Prefered Med-pack or regen health?;
Why not a NPC-medic that can heal you (or for future games med-bots)? Regen is just plain stupid... med packs only made up long ago as some excuse to throw in 1000 enemies...