Though I liked Pride and Prejudice and Zombies, I haven't made a mad dash to read other classic/paranormal or horror mash-ups. It seemed like an idea that worked marvelously once, but would quickly become a leap-on-the-bandwagon sort of thing with other books.
However, I do like the idea of mashing up Cinderella and Sleeping Beauty with ninjas and vampires. I think what's attracting me is the hope that these characters will become women who do something instead of women who have things done to them.
I'm not as crazy about the "special twist" giving readers "the opportunity to make key decisions" for the main characters. But if I come upon one of the books, I'll give it a chance.