The streams was doing some experimenting. He would stand in front of a guard, push it, and the guard wouldn't react. Guard would walk by him, he knocks him out and then throws him down some stairs. When he does this, the body literally slides down sideways with no sound effects. It really looked like a game of Slip n Slide. He kept knocking guards out, tossing their bodies down the stairs, and they would just slide down.
Later on, in some secret underground bunker, the player had to solve a puzzle. He has to keep through heavy underground brick walls. He sees guards having sex. Cue horrible cheesy sex dialogue. Except that when you leave the wall, run down some stairs feet away, you can still hear the dialogue as if you were standing right in the room.
The AI was abhorrent. Dude was playing on normal and he would alert guards of his presence, run into next room, hide in closet. Guards would then enter, make a BEE line to the closet and just stare at it before moving on after a minute to check elsewhere.
It was so laughably bad, I don't think words do it justice.