Finally finished Mankind Divided after two years since starting it.
While you can go all Rambo, the stealth/hacking route is without a doubt the way it's intended to be played.
And it's here where the game truly shine. Tried pure action for fun, and it's unremarkable.
Overall, I recommend it but there's much more to it than just that.
Pros
World-building, Enough material to get immersed, slow-burn
Enhanced mechanics over Human Revolution
Lots of freedom how you want to play, Stealth/Predator/Action
Good visuals overall
Music, esp. ambient, is top-notch
Good voice acting
Solid stealth gameplay
Cons
Literally unfinished, Ends on a dime
No satisfying conclusion to build-up
Many interesting characters/organizations only teased
Repetitive level design principles
Highly uneven pacing, Way too much time spent in Prague hub
Prague hub is simply less interesting than prior ones
Not enough (mechanics) has been reworked/added from Human Revolution
Animations repeat too much, feels stilted
Too few major characters, Most of them are too shallow
Side missions are a wash, Fail to be impressive both in scope and quality
Long load times, coupled with constant need to travel for missions, it's a pain
In the end, it's a formidable sequel to the great Human Revolution. But it's an inferior one in most important aspects.
Especially, the fact that conspiracy groups and theories that are quintessential for the Deus Ex series are painfully underutilized. Let alone, expanded upon with interesting new layers or theories.
Squandered opportunity, where I understand that publisher Square Enix can be pointed at for the most part.
Ultimately, reasons don't matter. The end product and experience does.
In that case, it underdelivers by way of too little innovation, too few locations, too much focus and thus overuse of Prague hub. Most disappointingly, a story that lacks in impact. For a series that regularly put the player at the helm of globe spanning and human destiny affecting levers, you feel like a small-town detective who does menial work most of the time here.