I wrote a review of this here: http://www.jgoodwin.net/?p=703, which has so much in the way of spoilers that I thought I would have to include most of the post in the spoilers tag to meet the guidelines.
In brief, I thought it the discrepancy between how much the player is likely to guess about the situation and how little the character figures out on his own was well handled and most interesting to me from a design standpoint, though the game is also thoroughly implemented.