Short Version: Not enough zombies.
Longer Version: This book is just a copy of "Pride and Prejudice" which someone copy and pasted into a Word document, then replaced various words, adding "zombie", "ninja", and excessive bodily humor references. There is little to no adaptation or wit. And how a zombiefied British countryside relates to Eastern martial arts bewilders me. The gimmick was funny for a chapter or two, but not an entire book. Not to mention, the book retains all the difficulties of the original, chiefly that the entire plot happens off-scene in letters.