Anyways, a few things I couldn't process in my head as I writing this at 1am or so in the morning after playing it ahaha.
(1) Locations!!! For the love of God, the locations are amazing. China is just the most expansive setting, comparable to the visit in the original Deus Ex to Hong Kong. I honestly just love the Shanghai/Hengsha area because it is a paradise for a fully-upgraded 'hanzer'.
(2) Hacking Mini-game: I know a few folks who got sick of this for awhile, but I thought this was the most immersive hacking system. It is thoroughly consistent and it can be learned even without the assistance of the Hacking: Info Augmentation Mod.
(3) MGS except better warning system. Essentially if you loved MGS, you will love this game as well. It shares a lot of similarities, though it has been noted that Adam Jensen starts off weaker than Naked/Solid Snake or even the guy from Splinter Cell.
(4) Methods. I know I mentioned this in the review, but the methods to this game to play it just make it replayable like Mass Effect, but it is unique in that most jobs aren't just simple retrieve an return jobs. All of it advances the storyline. There are few throwback achievements that are hidden until you do it that harken back to the original Deus Ex. Punch through walls, hop from tall buildings, etc. God damn it's a fun game.
(5) Easter Eggs. By God this game is loaded with a ton of Easter Eggs that aren't necessarily hidden, but you have to look as they sit in plain view (or hearing). If you walk through alleyways you hear random folks whistling a certain tune from the original game. A gramophone plays the Cathedral theme. Robocop mentions. Funny passwords an login names. 0451!!! This game is the king of Easter Egg Hunting.
(6) Just overall fun. Like Cutscene mentioned, this one of very few games that can just be played in an addictive fashion that doesn't require an internet connection.