When ever you hit a zombie with a melee weapon, they get constantly stunned. There should be random stuns to make it harder to kill zombies.
A server can disable zombie stuns, it’s just that nobody does it.
Ok new idea. Zombies with armor should have a rare chance to get stunned because they have armor on. Zombies with weak or no armor have a higher chance of getting stunned. And I’m not sure if mess can get stunned, but if they can, remove stun from them.
or you could just not play on easy difficulty