The problem with this is that Pride and Prejudice and Zombies is complete and utter ***t. The only thing that's clever about the whole enterprise is recognising that 'rewriting' zombies into a public domain book can be done extremely cheaply, and with massive profit resulting.
Look, I know I'm the literature student and I'm supposed to scoff at this kind of thing in some kind of display of ill perceived superiority, but please... anyone in this thread could have 'written' this book. All you need to do is get a freely available text version of the original, and randomly insert the words 'zombie' 'hoarde' and 'dojo' into every third sentence, with the odd nob-gag thrown into any conversation between the romantic leads. There are no clever sequences of zombie-based mayhem. It's just the original with a few out of place sentences coughed up by someone who has cynically come up with a great idea, and can't be bothered to do it properly.
As for the film, it could be more worthwhile, because I cannot imagine anyone will actually base their script on this tripe. But, it's got far more work to do in satirising the original because Pride and Prejudice has been filmed (and alluded to, or satirised) far, far too many times already.