Way too much structure. Zombie killing games should be about killing zombies, not completing complex missions that rely on being able to go around the zombies without getting killed yourself. I am a fan of mowing down the undead, not tip towing around them in order to give some "zombrex" to a little girl in a specific time frame. If they did away with all the missions, and changed the goal to only surviving through a level it would be much better in my opinion.
This is a game you'll love to hate. The only good thing about this game is being able to kill zombies. It's almost impossible to complete every mission, save all Survivors, and kill every Psycho in one playthrough. That's not even including the rigmarole for Trophies/Achievements. When Chuck dies, they give you the option to restart the game while letting you keep the progress towards Chuck's stats and Combo Cards collected, but they reset the Zombie Kill Count (ZKC) back to zero. I only managed to kill just under 5k zombies before completing the game. So, how do they expect us to reach a 72k ZKC without letting any messages, for saving Survivors or killing Psychos, expire? Letting a message expire is no different than failing. Luckily, those failures don't count against Chuck in his quest to clear his name and finding Katey the Zombrex she needs every 24 hours. Even after beating the game, they still only let you keep Chuck's stats, Combo Cards, and the clothes on his back. If you decide to play this game, I'm sure you'll be equally as disgusted with it as I am. I'm on PSN with the same ID so hit me up!