Something that is seriously needed is the ability to control your allies. Also that they don't go "DERP! IM BORD SO LETS GO KILL THAT FURFAG OVER THAR!".
I find henchman with leadership really helps, as it seems that the enemies won't actually attack your base until all of the minions defending it are dead. With a leadership unit, your forces work in one organized band, making them extremely potent.
Very few glitches, great graphics and animations, in-depth and enjoyable gameplay, keeps you occupied, doesn't get old, great upgrade system and hilariously EPIC! 5/5!
This must've been programmed to lag. Honestly, for the first 30 mins of a game it'll be totally lag free and smooth. Then, out of nowhere, I lag to death.
Soldier: So, do you want to leave this zed infested gas station?
Survivor: No, i'm cool.
Soldier: But we have food, shelter and electricity.
Survivor: Nah, I like it here.
Soldier: But this is the only place that isn't under our control and this is the one place still full of zed.
Survivor: No really, i'm fine here.
Soldier: ._.