Battlefield: Bad Company 2
I love the BF series more then any ohter game series but the regeneting health sucks in that game!
First of all you dont have a healthbar in your HUD but you can se what other players in your team has in health and you see what the guy who killed you had in health!
Secondly it doesnt really tell you when you have regen enough health to take a bullet without dying unlike CoD that you become blinded by blod to tell your about to be screwed!
Thirdly it takes away the reason for medickits in BC2 as of now that peaple use only for faster rengen. In the older installments it was an escentual part of what made BF different from most other FPS's.
That and 64 players maps, vehicles, knife as a weapon and not as melee and realods that are realistic meaning that when you reload with bullets still in the mag, they are spent and doesnt automatically bunch up with the rest to be used at another reload.
So the solution to this would basically be to make it exactally like BF2