Oh, I'll just stay behind this corner and abuse the camera to see around it. How awesome! Well done Ubisoft.
It's not like you can stick to the wall like Rainbow 6 with a cover system and use the camera. You still could only lean a small amount. No different to a FPS where you can hide behind a corner and use the camera to see someone before they can see you.
Although you could do that a lot in the single player.

