I agree with Kalendan1. I don't play the alpha virus event at all as a result. I don't want to play competitive with other players. I'm here to make friends, cooperative and kick some zombie asses, not holding off my firing just so that the alpha carrier can die quicker when he's swarmed by other zombies. This really brings out the ugliest of us.
I also think the bio aug should add hit point to the user per shot, instead of per kill. Some monsters are just so tough to kill and what? 30 HP at full 10 augs only? Per hit would be much more reasonable.
 "SAS: Zombie Assault 4"){kind=icon}
 "Mad Truck Challenge"){kind=icon}
 "Zombotron 2: Time Machine"){kind=icon}