Seeing through doors is fine in this game. The player can do it to using things like "ping" or taking control of cameras, so I don't mind if enemies can too. Trying to attack through doors isn't very smart though. However I also very much enjoy when AI has an enemy hiding away in some corner trying to hack my brain while I fight off a few others directly. Or when an enemy I'd tagged but lost track of visually has taken a path around me & come up from behind. So there's some problems, but in general it seems okay to me.