The problem with Pride and Prejudice and Zombies
isn't that it defaces a classic work of literature (which is a perfectly acceptable mode of responding to literature), but that it takes a joke with a life of however long it takes someone to say, "hey did you know there's a book called Pride and Prejudice and ZOMBIES
!?" and stretches out to the length of, well, Pride and Prejudice
. It's a twelve-second gag, and suffers as a 320-page one.