I didn't find the setup or the ending to be particularly satisfying. And I found some of the banter between characters to be pretty hokey (especially the constant quoting from action movies).
Now that I've gotten that out of the way, let me say that this is one crazy, action-packed read. It's nearly non-stop from start to finish. I liked the depiction of the vampires. They're not sexy or sophisticated. They're like sharks in a feeding frenzy. There were also a handful of nice little illustrations that highlighted some of the crazier concepts. These were a very nice touch.
When I learned that this novel was written by FOUR(!) authors, I was pretty skeptical. I thought the mix of styles would be jarring and distracting. But I didn't find this to be the case at all. It was really pretty seamless throughout. Nice work, gentlemen. Nice work.