AI for the soldiers / vision/ detection is pretty good
In the first level where there's a guy talking to another guy in vehicle by a small house, I shot them both, then another vehicle drove over one of them and past the guy slumped over the steering wheel. Admittedly it's at night.
i've got the settings at quite a high level for realism - not sure that changes the AI on the soldiers - i think it did in previous versions. I found that i was coming down some stone steps in a small room and the soldier in it around the bend heard me and came looking!
In the first level where there's a guy talking to another guy in vehicle by a small house, I shot them both, then another vehicle drove over one of them and past the guy slumped over the steering wheel. Admittedly it's at night.