From a sales perspective, the box art is important to produce sales from POS stands and traditional gaming retailers. I think the cover looks ok and could look better. The cover could just be the games logo for all i care anyway, the game needs to speak for itself. The fact that this game won't have multiplayer is a good sign that this game could be a possible game of the year for 2013.
Not great IMO. Technically sound, but the artistic direction looks like it's taken tangent from the dark, menacing and intricate nature of the game. Bright colour palette, fine. Joe Rambo cowboy poster boy posing for the camera, not fine.