I really enjoyed the film quite a bit, actually. I saw a sneak preview this past Saturday. And, I agree with you in the fact that, if you are going to assemble a cast involving Norton, Wahlberg and Theron, you would release this in more than 2500 theaters on opening weekend, but, that's all they've decided to go with, and, I don't see the film being marketed all that much.
I will say that I liked it. I see this as one of those rare, intelligent, well-thought-out thrillers, in the mold of "Heat." On a scale of 1 to 4, I would rate it a 3.5. It was a good time on a Friday night.
JP