HvZ is about being fun for both sides. Having it Cod zombies style would be like late game hvz where there's only a few humans left with everyone else a zombie. Those don't last very long. The difference is that the last few humans in that case actually had to survive long enough ...
In several of the maps, small monitors called "citadels" are present around the map. These citadels A Polish fighter jet can be used to call in air strikes, back up teams, and even drones. On one multiplayer map titled "Streets", zombies will appear halfway threw and swarm the winning ...