I've invested a few hours in this, so by no means can I say I *know* this game. Today, however, I dropped the blinds and killed the lights and wandered into the mechanically magic world that Corvo lives in. From the first moments when your ship docks and you're lowered into the water Bethesda draws you in, engages you in events. And it is subtle - as subtle as having a first person perspective for so many aspects of it.
It's incredibly well done with an engaging story playing in the background, rich and dark and dank atmosphere and visuals that stretch your imagination. If you've met Granny Rags or seen those black orbs of the Outsider you'll understand what I mean. The game has managed to pull me in and engage me; there are times I feel all hollow in my legs when dancing along a ledge or when lurking in the shadows, crouched behind a crate I'm worried the noise of my heartbeat will alert the guards.
Mechanically it is as they describe it - a stealth/action game. Those of you who have played Deus Ex will be familiar with the concepts; this is like that but smoothed and polished until it's as silky as butter. Load times are blisteringly quick and mistakes are not too harshly punished. You have a good selection of tools at your disposal and different upgrade paths as well as achievements in-game in the form of in-mission collectibles.
It's a game with such a vivid and interesting world it makes me wish for something to read about it - a good novel, graphic or otherwise. If you can pick it up on the Steam sales (US$22.49 until the 3rd of January, 2014) do so!