One point I remember vividly is not getting into a club in the first game and saying to myself "lol i bet there's a vent right here in this alley directly next to this bouncer that lets me in" as a joke but then it was totally there just like 5 feet away lol. Not good.
Huh. This one surprises me. The prequels have had issues, but I've never seen someone just hate them both wholesale. I would say Deus Ex is probably my number one all time and I thoroughly enjoyed HR and MD, despite the flaws in each, but if they didn't hit with you as a fan of the original then your criticism seems fair.
Was your disappointment with Mankind Divided for the same reasons as Human Revolution? I know the main complaint is the core story-line feels incomplete, but I found Prague to be a interesting place to explore with a lot of unexpected details, and the side missions fleshed out the world in some interesting ways.