I don't see how this game could get anything aside from a 10/10. The graphics were quite good and considering how well it runs, it is just amazing. I didn't drop below 60 fps, even with motion blur on which I hear gives quite the FPS drop. The story and gameplay, well it's like Left 4 Dead, except good, and actually pertains to zombies. The AI was off the charts well done, albeit the common zombies were a tad easy. The psychopaths made the game very enjoyable because it wasn't a faceroll. And the saving system, holy stuff it is the reason I liked this game and GTA, the saves aren't handed to you on a silver platter whenever you want. Friend and I played through all 3 days the first run through to level up which took about 10 hours, then followed up the next night with a 12 hour run through the story, our gaming sprees don't typically get that bad. And there was much raging at the final boss fight which mad the ending all the more fun because we actually felt like we accomplished something.
And some pro-tips for people having problems with bosses, always and I mean always have at least two Painkillers(beer+beer, vodka+vodka, etc) on you, restores full health and reduces damage taken by a lot for about a minute. And combo weapons are your friend, never have only regular weapons on you they do next to nothing on bosses.