My dad got me this book a while ago, and I really should've read it sooner.
The first 140 pages or so were the book's weakest. Not that there wasn't useful information contained in them, but it seemed to take a lot of pages to basically say "the Bush administration didn't plan very well for postwar Iraq," which should be quite clear to everyone by now.
I really enjoyed (if you can call it that) the book after that point, once the war starts and Packer is able to talk to people who have been affected. That's where the strength of the book really is, in the attempt at understanding the human situation.