The Killer Inside Me got a lot of press for its gruesome beating scenes. And yes, they were gruesome. And I'd imagine in a brilliant film, those scenes would be enough to turn people off. The problem is, this is not a brilliant film. It's not really even a good film. Our protagonist, the serial killer, is under-characterized and pretty much without motive. He kills because he's crazy. And he's crazy because his mom was sort of crazy. And he's not good at covering things up and the authorities are on him from the beginning. And he doesn't really seem to care much whether he's caught and neither do we. It's just a blah of a movie with two incredibly realistic beating scenes.
I like Casey Affleck a lot. I think he's a terrific actor. But this movie is dull and the shocking bits are nothing except shocking. I'm guessing playing a crazy serial killer would appeal to a lot of actors. It's just too bad a better story wasn't written around the character. (I've not read the novel. I hear it has some dark humor it. I wonder...)