Plus I felt that the movie hinged on the performances and those subtle shift in characters as the situation becomes clearer. But I didn't feel this matched with a cinematic tension. An example would be the fight scene, it was dirty and riveting but felt a little heartless and cold (sterile even). Such that one of the key moments lacked that tension that the characters were obviously displaying.
Although I probably only noticed this because of the hype and raised expectations. Still one of the better films of the year, just not "the best".