Saw it last night. If you expect it to be anything remotely resembling the book, you will be disappointed. So don't expect the book and enjoy this for what it is, which is awesome. It is an excellent action film from start to finish. Brad Pitt is a new kind of action hero who uses his brain more than his gun. His sidekick is a female Israeli soldier who is actually fully clothed throughout and impressively tough.
It's a new take on both action and zombie films altogether. There's still some good jump-out-of-your-seat moments - as you'd expect from 3D zombies. But overall, this is a smart, very entertaining movie. Definitely highly recommend.