1. I find a good spot with not too many people too fend of zombies, I get picked to be a zombie
2. I find a good spot to fend off zombies but have shit luck getting to it, don't get picked to be a zombie but can't get to a spot so I get killed by a zombie in the process.
3. I get to a good spot and don't get picked to be a zombie, too many people and one idiot always stands too close to an edge then gets knifed by a zombie then turns around and knifes the rest of us.
4. I get to a good spot and work on a barricade, too many people in the spot shoot the barricade as well and fuck it up leaving us with no barricade and we all get knifed.
5. I get to a good spot with not too many people and everything works good, the server lags and we are unable to fend off the zombie attack.
6. I get chosen to be a zombie, all humans find perfect spots and zombies can't get to them = 5 minutes of frustration.
All of those scenarios multiple times all day long.