In CoD MW 2 (or maybe Black Ops) the multiplayer AI bots were like this. Obviously all bots are but the kill cams were illuminating. And they didn't even try to make it look human. They'd even use a light machine gun. They'd walk around. Once they see you they'd turn towards you. The only thing the difficulty changed was how fast they turned. Then they'd shoot a single shot at your head. For things like a sniper rifle it looked mostly believable, but that's not how people use machine guns lol. The single shot with the most inaccurate weapon is just dirty lmao.