Wow, I have to say, for such a simple game, it's a whole lot of fun! It takes a lot of skill, and for that reason I rate it 9/10, simply because I would have enjoyed it more if it had been a bit more colorful.
Oh yeah, if survivors don't have a gun you give them then they have this tiny lame ass pistol which sucks balls. But make sure to give yourself the best gun because you can make good use of it.
Holy crap, amazing game, on my last round in union city my barricade fell, my survivors fled and I killed the 5 remaining zombies just before they killed me! Phew! That was amazing, a great game, combining strategy and action. I rate it a solid 10/10