I don't know if anyone has let the implications of one of my videos sink in (SPOILER VID HERE), but yep, I beat Perseus Mandate at Extreme Difficulty without using the game's SloMo (bullet time) feature.
Turrets? Check. Lots of weapons and health lying around? Check. Orange-tinged level? Check. I don't know about you, but this whole level is a spitting image of THIS.