This answer contains spoilers… (view spoiler)[I did NOT know it was a zombie book, and being that I hate zombie books, I was upset when I realized. It was definitely thrilling and I couldn't put it down, but I would not reread it and I wouldn't pick it up again knowing it's about zombies. (hide spoiler)]
Bekah I don't think so. I do think going in totally blind is much better, so I personally wouldn't mention it while recommending the book to others, as I would want them to be surprised. But as others have said, you figure it out quite quickly, so it isn't as if it were a last chapter revelation.