Most modern FPS and Action-adventure games: Inexplicible wolverine factor.
I prefer a HP meter to every single hero I play being wolverine, capable of taking fifteen headshots, being near death, but if I sit still for ten seconds I get fully healed again! Who DECIDED this should be the way to go for games? CoD2, Gears of War, Halo 2 and 3, Uncharted and to a slightly lesser degree, Resistance: Fall of Man. These are just the ones of the top of my head too, and only Resistance actually tries to explain your mega-healing factor away.