I don't think I've ever had to use the "hardest" difficulty to make the game a bit less easy. Press button to perform takedown with no other melee options? Commonly called sandwich gameplay I believe and not a very favored design option.
And story/dialogue/writing depth wise it was about as deep as console gamers can take I suppose. The big part in the story was transhumanism - yet there were no meaningful dialogue to be found (I recall the press conversense vaguely). Some interesting E-mails, but that was it. I can still quite vividly recall some of the conversations in Dx, unfortunately none from DxHR. Same for the characters I guess.
Yes the game was well done and I also don't recall any real competition for it. But as a Dx game for me it still came short in a lot of other segments, which it seems are not very important these days due to the lack of attention span and required oversimplifying to appeal to masses.