Whenever I'm on, zombies usually wins on all of those maps and people don't complain about spawn camping.
From what I've seen, usually that is AFTER the fasties are unlocked, and they can lunge out quickly, or after EVERYBODY has killed enough zombies to get the high powered shit - which takes a bit of a while if it's 3 v 1, 5 v 1, 20 v 3, or 25 v 10, or whatever, and enough are gathered around spawn. Even with high heath creatures like poison zombies, I've seen it before where it was say 20 humans, 2 - 3 [sometimes more] zombies, the humans all gather 'round in the immediate vicinity of spawning, and fire off enough where between the bullets firing at a rate where the healing effect of the green fog is rendered useless, being paralyzed from being hit with bullets [game physics], or just being killed soon after you first spawn from being hit with a shovel, etc, it is *practically* impossible to play.
I don't see why it shouldn't, it's not like humans can respawn or something they run out of health and have to retreat,
Even so, constantly killing zombies IN the spawnpoint, continually, and not even more than a second after they are able to move? Really?