Much to the disgust of my brother, I read Pride and Prejudice and Zombies: The Classic Regency Romance - Now with Ultraviolent Zombie Mayhem! by Jane Austen and Seth Grahame-Smith. I think my brother's disgust lay in the fact that Grahame-Smith is blatantly adding in a shock factor to drum up sales...which, yes, is true, but obviously caught my attention (and many people's).
First up, the cover. It's gross. So gross that I kept it face down when I wasn't reading it.
The book itself...well, yes, it's a gimmick. It was sometimes amusing, sometimes weird and other times, well, bizarre.
I did notice that Grahame-Smith made Elizabeth an anti-Christian character, which wasn't necessary. The reader's guide questions at the end of the book made the author's opinions toward Christianity and the church made it clear that Grahame-Smith wanted to add mockery about that faith. That sort of tainted the book for me. I mean, it's one thing to enjoy the addition of zombies and all that silliness but to add his own worldview and opinions to a classic novel that doesn't say anything on the topic is another matter.
So read it for the gimmick but don't expect much more.