About an hour in to the mission I discovered that Nazis are actually kinda dumb and you don't really have to be very careful at medium difficulty.
Also, i don't understand why there are non-lethal options in this game, but I suspect there may be liberalism afoot.
I should note - If I did knock a Nazi out I specifically went back and shot them in the head. Those ten guys were accidents. Would have gotten them if I could.
The first mission of 5 has been good. there's lots of sightlines from 100-400ish meters. You can shoot nazis in the leg then cap their buddies when they come to help. Lots of sitting in church towers sniping at people.