Sitting in the middle of a vent? they see you through the wall. Hiding on pipes up above them, they see you because they have eyes on the top of their head. Etc, etc.

How the ♥♥♥♥ did we go from Dishonored to this heaping piece of ♥♥♥♥?
I mean come on Dishonored was absolutely amazing and still is and the stealth was just as good, THIS game on the other hand is straight up ♥♥♥♥♥♥♥ pathetic.

It's very strange, I haven't encountered such problems, although I play mainly stealth, and it's even easier than in Dishonored.

Yeah, generally find the AIs pretty hopeless at spotting you while you're making even a basic effort to sneak.

I have yet to figure out actually killing people without being noticed by others in most cases, but just sneaking works great...