Yes it deviates from the original story quite a bit. Big deal, who cares? Director never stated he'd strictly adhere to it. The rest of the bad reviews are either pathetic wannabe movie critics that reek of a superiority complex or people that can't stomach gore. "How far have our standards fallen" oh shut the fuck up, whining about how poorly written a movie that most the audience enjoyed doesn't make you any more sophisticated and important than them.