Oh man, this game - this easily could have been my goty if they had just cooked it a little longer. The level design is amazing and the moveset is pretty much perfect for a hardcore stealth game (although I wish you didn't have to unlock moves like a corner takedown, etc.)
But stupid stuff like not having a button to drop down on a ledge, the weird floaty jumping, not being able to shimmy around a corner when hanging, crazy physics when you touch an object (chair goes flying from a gentle brush), etc. I don't know why they released it this way. Love it otherwise, though.