I also loved Human Revolution and got all the achievements for it. Quite sadly, I have a save file in Jensen's apartment. I love how the blinds open and the music that plays whilst you nose around. The little touches like seeing the flock of birds fly past if you look out the window are amazing. Pet peeves were:
1] Despite installing the game to hard drive, the engine still stuttered quite frequently when moving quickly around the hubs. It wasn't game breaking, but it did take me out of the experience quite a few times. I haven't played it, but I suspect the pc version wouldn't have suffered from this.
2] The rag doll physics. If I need to move a guard I've sparked out, they shouldn't resemble the worlds greatest contortionist whilst unconscious. I'd prefer a normal animation of seeing the protagonist's hands moving and lifting things.
3] Give the protagonist more animations whilst talking to other characters. The amount of times Jensen would dip to one side and fold his arms mid conversation was irritating. Whilst on the subject, give recurring characters like the arms dealers more dialogue. We've established I've got the egg head discount now ffs! (one for the fans there.)
4] The boss fights.. I think most people were naffed off with just how much they contrasted with the play style of the rest of the game. They could have been so much better. I quite liked the idea of how the fight with Jaron could transpire if you had made a certain choice in Hengsha. For me, there wasn't enough of a cathartic moment considering what happened to Jensen at the beginning of the game.
5] More variety in the hacking sub games please! Also, some plot driven hacks alarmed ridiculously quickly regardless of how you had augmented Jensen.
6] A stat counter of how many times you'd been spotted, killed someone and set off an alarm would help players attempting certain achievements. I nearly shat myself waiting for the "Foxiest of the Hounds" to pop up.
7] An ending that is canon please!
Every ending from the four available was the 'right' choice according to Jensen's monologue. Of course, they all had their respective points of view but which one was the correct choice?! Hard to discuss without spoiling it for any that haven't played. If that is the case, buy it and give it a fair go. I have so many good memories from multiple play-throughs.