You know, after years of either schlocky or goofy zombie books and movies (Shaun of the Dead), I remember WWZ feeling very fresh when I first read it, back in '08 or whenever it was. I'm not normally a fan of the genre, but I appreciate the thought that went into it, and the oral history style was also a breath of fresh air.
Yeah, pretty much any zombie apocalypse book has to massively cripple the military in order to explain how it's defeated by an enemy lacking any kind of anti-tank, anti-aircraft or anti-shipping capability (or even any kind of ranged weaponry), but it was interesting the way Brooks used the zombies = virus/disease analogy and made it work.
Certainly, it feels much more grounded than Robopocalypse, with its magic-eyed girl and freedom-singing fembot right out of Robotech. :P