there should be a gun custimizer (barrels,lasers,Grips,etc.) and person custimizer too.also instead of terrorist zombies there should be regular zombies and there should be a squadand a story line for example,Platoon seperated and only 4 or 5 soldiers left.they find a mini mall (drug Store,Gun store,mcdonalds:D,etc.) they alsow should find surviver to.:D