Loved it!
I think that this book is one that has a very niche readership. It's not every bodies cup of tea, and that's okay.
I, for one, loved this book. It's a post-apocalyptic story, but it's not your usual zombies, this instead is mutant creatures.
As for other reviews saying the language was poor, I don't understand it. Perhaps when it was first released it was sub-standard, but the version I got was fine, so whatever issues there were must have been fixed and released by the author.
I'd definitely recommend this book to anyone who enjoys apocalyptic stories.