Currently, the zombie horde spawning is insanely unrealistic. I could clear a whole neighborhood, than just while kiting one horde another horde spawns IN the horde. As if I wouldn't know after 100 shotgun shells and a few molotovs that the horde just tripled in size. The zombie spawning should be more realistic, perhaps make them only come from places unexplored in a long while, or make them spawn from the highway and have meta-game sounds lure them towards you. Otherwise the whole realism of how easy it is to die kills the fun of the game.