I've just started playing so I pretty much suck at this game right now. However, I'm a huge fan of 1-shot takedowns thanks to the likes of the Rainbow Six series. Anyway, I was on the mission where you clear out the church or something. On the first enemy encounter, I was able to sneak up on the German until approximately 15 ft away. I had my reticule turned ON and centered perfectly on the back of his head (no helmet interference). Anyway, I cracked a round off and the German just tucked, ran and jumped over a brick wall. I replayed this 3 more times, same outcome. Now let's face it, in the real world that round would cause almost instant death. Anyway, just wondering if anyone else is having a problem with this.
I don't know if you ever get a sniper rifle in the game (assuming you do), but I'm sure that has instant kills for head shots.