I think if you had no idea the book existed and saw the movie like that, it would have been at least entertaining. Not great, but worth a rental. The fact that it only had the title in common and that's it without taking anything from the book is what killed me. It's like when they bought the rights, they essentially just wanted to buy the name and make their own movie. Plus, how can you not have te Battle of Younkers in there?!?!
Its really a shame. WWZ would really have been best as an HBO series.