I agree, the first zombies sometime have insane hp. Yesterday I had a 850 hp zombie and with the steamroller and bloodsucker upgrade i couldn't die once the whole round. I don't know if it's supposed to be balanced, but it was fun (not for the humans though) Zombines: Yes they are hard to kill, i usually just let them explode, run away and don't waste ammo. But in an uncaded last stand they are impossible to stop if more than 2 are attacking. I would like to see the poison zombies with such durability, because they just die too easily imho. Yes the HP at start is extreme sometimes, It even drove me to ragequit (really small chance i do that) Not fun to see a zombie take down 10 humans (and me ) in 1 single life while he's being shot at with 15 pistols for 2 minutes.