The much-maligned boss fights for Deus Ex: Human Revolution were outsourced to Grip Entertainment. However, main DX:HR developer Eidos Montreal says they're responsible for the poor quality of the encounters.
"The problem was not the supplier, it was what we did with them," producer David Anfossi told Edge. "The boss fights were too much for the team to do internally in the time we had. We totally underestimated the effort to do that correctly. We had to work with an external supplier with that, but the design and everything is from the team at Eidos Montreal."
Ultimately, Eidos knew that the boss fights would turn out poor but decided to include them in the final product anyway.
"We knew that it would be a weakness for the game, that we had to make a compromise to deliver it [on] two levels," said Anfossi. "First, the boss fights were forced, which is not the Deus Ex experience. Second, there is no mix [of] solutions to tackle the boss fights, which is not Deus Ex either. We knew that before the release of the game, but there had to be some compromise. It [was] our decision."
The last boss fight was actually pretty true to the DX philosophy, in that there were a few different ways to beat it. The other bosses fights, though? Bleh. They were basically just one-on-one gunfights, making them very taxing to players who had opted to develop, for example, stealth or hacking skills.
Still, on balance, Eidos did a tremendous job with Human Revolution. If you were a fan of the first two games, I strongly suggest checking it out. It's very true to the character of the original games developed by Ion Storm.