Marksmenship: In games, I can snipe the wings off a fly from 500 yards without killing it. In real life, I am not so sure. I have only ever used a real gun once, and that was a pellet gun. However, I used a bow once and without any training (other than videogames), I got a bullseye on my first shot and consistanly hit well. Maybe games DO have a bleed-over effect? [http://tvtropes.org/pmwiki/pmwiki.php/Main/IKnowMortalKombat]
Stratigic command: Maybe. Most of the stratgies I use in games are based off of real stratgies and by reading books like "The Art of War." So who knows.