What can I say, I personally loved this game but yeah at the end I was left with a bitter taste. It's not Eidos Montreal fault, rather Squeenix: not counting the sly cutscene after the credits, the game ended as if it was a season finale. It's a good game, but cut.
About story and narration, I do think there is a lot of background fiction, reading all the emails and opening all the secret stashes and ebooks, listening carefully to dialogues you discover (or remembers as a reference to the first Deus Ex, cutscene after credits included) a lot more stuff than you get to see following the main story. That's why I would say while we have a discreet main story on a "visible" level, no really special events, vault cutscene part aside, background and narration are very good in my opinion. It even tells you more about side characters. There is even one single email that convinces you about the identity of a certain mole, and then all pieces come together. Side quests and your surroundings help a lot. Eidos did a terrific job on that.
Gameplay is basically HR 2.0 and that's what I wanted.
I do agree that "Augs World" setting was unlikely because it was think that only "race" and fear of something foreign wasn't just enough since we have to deal with machines. But it's curious noticing that while the world is divided, Jensen brings up and solves questions with augmentantions, the tool people fear. I liked "Prague" for good level design, where every flat or alley hides something unique.
I miss Pritchard and Malik.