Even with aiming for the Head it takes way too many hits and too long to kill them. With an axe. Other Weapons like the god damn Bat are near to useless against zombies, even with aiming for the head, wich results in neverending fights where you almost have to pay attention not to starve. in game or in real life. very frustating, very unbalanced and this does not increase the feeling of a survival game, when you're stuck in those lame fights.