The audio-book of WWZ is an incredible piece of fine audio-art ...
I think WWZ - either you like it or you hate it. It is very "documentary style", thus I can imagine that people may not like it. It is not the classic story around a bunch of heroes or survivors telling "their" story; it is just a collection of many small bits and pieces describing the start, evolution and ending of the zombie-apocalypse from many different perspectives ... Therefore you don't have the climax-scheme or whatnot ... Just consider WA not being told around Michael and friends, but WA being told in a way that each chapter would be all about one specific and different journal ...
Anyway: WWZ - I enjoyed them both, and I am not so surprised that Paramount and Brad Pitt have so much trouble making the movie, because WWZ is not about one story, but about many small ones ...