I agree that there are loads of movies with few differences that are the same/predictable story. However, the most typical ignorance (and weakest trait) that follows for film "critics" is to become so cynical that you're ignorant to the fact that you've lost an understanding of film genre. Ultimately, you become out of touch with your perception, so much so that it's inane to deny that you then have difficulty enjoying film altogether, so you don't admit it to yourself out loud. Don't kid yourself that others can't see it. It's an easy path to follow, but it's also the most laziest minded habit. Take some time off. Relearn how to think for yourself, and realize that you've willingly replaced your ability to have free thought with ignorance. Relearn how to enjoy film. Or better yet, write and direct film yourself; with the integrity you currently feign to have.
All that aside, this film was great. Sam Rockwell was perfect for the part. I'm not much a fan of Kevin Spacey's work over the past decade, but he's simply got a speaking part in the film. This is one of the films that could easily be spoken of with refigure for years (even if in independent groups). It's worth its attention.