Read for class. I am completely serious. 
 It is a fun little story, of course. That much is obvious. It's low-brow, harmless fun. Many teenagers while away the time pretending to be heroes and one-man armies against the unthinking hordes. 
 There is another aspect, too, which bears mentioning. How would the world really function under such apocalyptic circumstances? Not very well at all. Imagine the reaction of the crazed fundamentalists of the Bush administration, or the North Koreans, or... 
 The world order would break down. Several billions would die, no question. People who have never seen war, never known want, would be forced into chaos. It's a legitimately terrifying idea. 
 Recommended for those who want a good scare, from zombies, or from your fellow man.