Human Revolution's boss fights were, for lack of a better term, the proverbial turd in the punch bowl. They felt completely different from the rest of the game, they really added nothing to the story, and some of them were far too easy. We found out later that the boss fights had been outsourced, and that made a lot of sense.
If the big confrontations will serve no purpose, we don't even want to see them in the game. Leave them out, and find another way to challenge us. Don't do this again.