Atmospheric, haunting, with a good plot line. Punctuated with nuggets of action, horror and stealth.
Because it is a game aimed at you on an emotional level of engagement, you need to be able to sit down and immerse yourself in this game to truly appreciate it. Not just play a rushed 30 minutes in between daily tasks, like perhaps you could with a one-dimensional FPS shooter or something more superficial.
I loved it, a breath of fresh, raw, mountain air for the games industry.