I hate fast zombies, but only for the fact that they make me frantically struggle to reload my suddenly uncooperative firearm before they jump on me and eat my ass (in short, exactly what they're supposed to do). Joking aside, I rather like fast zombies, because they're really, really scary. Sure, the traditional slow shambling undead are pretty scary in their own right, but there's just something about a guy who by all rights should be dead in the ground charging at you at the speed of an Olympic sprinter that makes your blood turn to ice. Keep those firearms close, kiddies.