Overall Feeling:
Deus Ex: Human Revolution comes as close to deliverying on its campaign promises as any game has ever dared before. The story line is an epic web of conspiracies and lies interwoven with a question of humanity and what it means to each player. By the end of the game you'll have created your own individual Adam Jensen whose final choice may surprise even you.
The Pros:
+Brilliant sci-fi noir-esque story.
+Interesting and relatable characters.
+Plenty of replay value.
+Deep and expansive world with plenty to do and see.
+An almost unpressidented level of 'play how you want'.
The Cons:
-The game does heavily favor stealth, if that's now how you play/wanted to play you can miss out on some of the side-quests/rewards of the game.
Just over two years ago now I was lead into a private booth on the floor of E3 to catch my first glimpse of Human Revolution. The demo that I saw then would set an impossibly high bar that no game could ever match. The demo show cased gorgeous cinematics, stealth-oriented gameplay, ridiculous take-downs in the form (in single, double, and five-at-a-time varieties) combined with dialog from the development team; which wound up selling me with one quote: "You can play through the entire game without killing anyone."