Survivors die too easily. Even when I set up a search party to have the highest possible survival chances, it only takes a turn or two to lose survivors. The extra equipment like tools or medkits give too little morale. The scopes on weapons are too small to be effective. Endless mode is pointless if you can't keep looking for survivors. Eventually you'll run out or be stuck with a small number. Zombies wearing helmets are too resistant to headshots. There's no way a hard hat from a construction site will stop even a 9mm bullet, but I have to double tap the construction worker zombies with everything except the sniper rifle. The soldiers' helmets stopping bullets makes sense, but they still feel very resistant to damage.
This game is good, but it didn't quite reach "great" in my opinion. It's fun all the same, worth a play through.