Catventurer: Except that based on that movie poster, I'm guessing that they're following the current Hollywood trend of licensing an IP then tossing the pre-existing plot into the nearest dumpster. If the original IP was so bad in terms of the plot, why would they want to license it in the first place.
andysheets1975: Eh, that's not a current Hollywood trend, it's just business as usual. Sticking to the source has always been rare for film adaptations.
Except that's not always the case. There have been adaptations that have mostly stuck to the book they were based on. By mostly, I do mean that the characters are fundamentally still the same people with the same desires/motivations, and the core plot is intact.
Examples of movies that have a reputation for being mostly faithful to their source material include: The Princess Bride, Harry Potter and the Sorcerer's Stone (as in the 1st movie only), Misery, Fight Club, No Country for Old Men, The Godfather, To Kill a Mockingbird, The Silence of the Lambs, The Prestige, Jurassic Park, The Shawshank Redemption, Stand by Me (based on "The Body"), and Psycho.
I think that too many film makers think that they're going to make the next The Shining, which is an incredibly good movie if you ignore the fact that the book's author hates the adaptation because that much of it has been changed. Too many times, movie adaptations of books as a whole end up being on the level of Littlefinger giving Sansa to the Boltons in Game of Thrones - equally nonsensical and will only make people familiar with the source material hate the adaptation.