I'm not sure how specific I can be without actually writing the thing, but I'll try to explain my thinking.
When I think about a game, the most important thing to me is what was cool about the game. What can you point to the game did better than or more uniquely than other games. Human Revolution was mediocre to average in every aspect expect 2. One is the cool dialog system they came up with (but then didn't take advantage of). The other is what I'm calling "set pieces", by which I mean semi-scripted connected sequences. The high point of the game, and possibly AAA gaming in this entire console generation was the crashed helicopter set piece. The way choices and consequences and role playing naturally derived from the situation using the base gameplay systems. To a lesser extent saving the hostages in the first mission, and escaping from the slums also qualify. There might be more, I need to play it again to verify.
So I want to write mainly about how good those situations are, and why they are so good. How all the elements came together to let the player actually play a role, and then having consequences for it.
I also want to contrast it with other "cinematic" games where the gameplay is actually more limited and thus worse, and with the original Deus Ex which generally avoided set pieces by just giving the player a sandboxish situation to create his own experience with (avoiding assigning a value to either one here, just noting the difference).
If you want a more comprehensive overall picture of the game, I can do that, it's your book. It's just the most interesting thing I can think to write about with the game.