This was my first Darren Shan book and I really enjoyed it. It was well written, with interesting characters and a good plot. And I get what he was doing with the racism angle, I really do. The only thing is that for a zombie book, there really weren't enough zombies in it for me.
That said. The main character, B, was really interesting. It was good to see a character who is actually the bully rather than the bullied. There's a lot of books about bullying, but they're all told from the victim's viewpoint. I think a lot of authors do forget that a lot of bullies are victims themselves and that their viewpoint is just as interesting as anyone elses.
All in all, I loved this book. I really recommend it as a good read. But I do think that it needs to be stated that the zombies take a back seat, and the plot is mostly about racism and bullying. Which is no bad thing.