For people who like zombies: Dude. It's a book about zombies. Zombies in MANHATTAN. Killing zombies and surviving and killing more zombies. Read it already.
For people who don't like zombies: Ah, ignore the zombies. Feel free to see them as a useful metaphor if you must. But don't miss this book. Whitehead is at the top of his game. There are many pages of writing so good, you'll feel like a zombie just ate your heart out and your life is slowly fading before your eyes. Wait! I mean, ignore the zombies.