"I don't know how many more times I have to say this, but I guess at least once: a boss fight is not just a random enemy who's eaten three times as many protein bars as everybody else! A boss fight is supposed to be a final exam for everything we've learned up to that point! Ideally, Human Revolution would have given the option of gunning the boss down, also maybe hacking some turrets to fight for you, or sneaking away up into the rafters to drop pianos on their head - but no, all you can do is shoot them. And considering I was going for the non-lethal pussy run, my tranq rifle and stun gun were a fat lot of good against a bloke who appeared to be occupying the same space as a combine harvester armed with a gun that shoots exploding furniture that kills you in two hits, so I basically had to quicksave every time I successfully made it to the other side of the room before my internal organs did!"