I got the guns at lvl 18
and my personel favorite is the beret. Its got 10 bullets in a clip and can kill 4 zombies in one shot, the best combo is uzi and beret for backup if you ask me.
I liked the graphics and the style, and i count the gun problems reallity since every gun isn't 100% perfect, any gun got shooting problems.
The sound was cool, but for some guns was a bit loud.
Violence was great (i like shooting zombies :p) and interactivity could be better but still very good.
Since this is an action game the humor wasn't good. Altough shooting a clown was pretty fun :D.
So overall a ten, and i'm considering in putting this in my favorites list. Oh wat the hell i'll just do it :).