Finally finished the game just now. Impressions:
[some spoilers below]
The game started out really promising, but after the first 4-5 hours (basically after leaving Detroit) the game started going downhill FAST, culminating in what was probably the most forced/staged and spoon-fed final sequence I've experienced in a long time. By the time I reached the end I was already fed up with the "story", hadn't developed any real connection to any of the characters and really just wanted it to end. The final boss battle was so laughable, out of place and cringe-worthy I actually considered dropping the game there.
Using hacking for pretty much everything got old really fast. It's really weird how even if you go through the trouble of actually finding a correct passcode for something, instead of being rewarded for your exploration/efforts, it's still more beneficial to actually hack a device and get extra XP/goodies from it. Hacking should've been more of a "fallback" solution if you've missing critical information/codes, not become the main goal. Especially in the Picus building, the repetition of hacking everything in sight was mind-numbing.
Also, unifying all skills + abilities under augs made no sense conceptually, and linking them (pretty much exclusively) to XP points killed any opportunity for proper character development, pacing and exploration. Why not have some special augs (e.g. Typhoon, cloaking etc.) be collected as special pickups? That way they could've actually had an extra way to reward and encourage player exploration, instead of just mindlessly giving out XP (the game's unified reward system) for practically everything you do in the game.
After a while, the only reason I explored was the hope that I'd find a weapon mod or something (and even those didn't seem to make all that big a difference in the end). After I'd finished combing the empty, rewardless maze that was lower Hengsha, I came to the bitter realization that there was nothing special or surprising waiting for me anymore in any of the rooms or areas I painstakingly gained access to. Most of the augmentations didn't really feel that meaningful aside from a few key abilities in the end either, and I often simply forgot (i.e. didn't care) to upgrade them at all.
Sill, outside of some major design faults, the game was generally enjoyable enough, despite never really delivering on the potential the first few hours promised. Ultimately, the game did feel like a modern, streamlined and "cool" new Deus Ex, but not really the worthy successor I was hoping for personally.
What a shame.