I also have to get out that I was not too bent out of shape that this was not going to be the book. The book is a series of remembrances, during interviews. They are over a vast swath of time and geography with countless characters. That is not a movie, but JMS at least attempted to capture the feel of the book, along with some key moving scenes, but hinged it around a character who would travel the world -- Brad Pitt's Gerry Lane. That was a good idea. But as production steamrolled on, all aspects of the book were dispensed with. There are the occasional reference, here and there, like those that pop up in mockbusters but nothing smacks of the original story. Sure, there are zombies and it is happening world wide, and that is about it.
The zombies themselves were impressive in a predatorial fashion, more like a hive mind of bestiality than zombies. Other than a few hints that it was difficult to put them down, we don't even really see them as the undead, more just infected people, like 28 Days Later. That is OK, but for the use of zombie and zeke in the movie. And PG-13 ?!? Seriously?? All zombie attacks take place off camera or in the blurry distance?!?! The ant piles are fun to look at but lose their appeal, considering they were the main element of the trailers.