I view at as a kind of Torment: Tides of Numenera combat vs Planescape: Torment combat thing. Ie, it's not like how the old game was like, but it's a reasonable interpretation of what it could have been like.
I'd say it's more like missing the point completely.
Human Revolution failed on three different fronts when it came to bosses:
1) Story. Gunther, Anna and Simons are all major characters who you get to interact with during the course of the game, so when you find yourself in a situation where you might have to kill these people, it carries some weight. In Human Revolution you could replace the bosses with nameless mooks and it wouldn't change a single thing about the story, because the boss fights are the only reason the characters even exist.
2) Gameplay and rules. The bosses in Deus Ex play with approximately the same rules as everything else in the game (probably with a slight HP boost compared to JC at least on the Realistic difficulty level,
CyberP can probably tell more), meaning that a single rocket or grenade will blow them into tiny pieces of meat. Human Revolution's bosses of course throw these kinds of rules out of the window.
3) Flexibility. There are multiple points in the game where you might encounter Anna, Gunther and Simons, and only Anna needs to be killed (although there's a glitch that lets you to avoid doing even that), which can be done in three different places and in very different ways ranging from a single line of dialogue to cold-blooded murder. In Human Revolution you've got closed arenas where you fight to the death, no exceptions.
Actually the least interesting thing about the bosses of Deus Ex was the "boss fight" part, mainly because they were never designed as some special set-pieces to begin with but simply stripped-down encounters that were exciting because of the role the characters played in the game world.
That being said, the Missing Link boss fight was a huge improvement to the main game in all three areas, even if it was very different from Deus Ex, and I wouldn't really mind if they went the same route in the sequel.