I'm not a gamer but I feel like throwing in an opinion / observation in here.
Speed of movement particularly before contact in these videos I've seen seems completely out of whack. There seems to be no real world relation to proper observation and movement not to mention other senses like smell, sound and feel in the pictured environments. Observation of an area seems to be completely for targets but not sign or tells. I would expect quite a few people with heavy video game experience to be making some very deadly blunders in an actual situation. "Training" in these games could become a serious handicap if the brain reverts to what looks familiar and by playing one is in fact training. Some examples that come immediately to mind are the bad guys look like one would be able to smell them quite a distance away not to mention looting eats up both brain power, attention to environment, and noise discipline. I suspect the greatest weapons were some of these game scenarios real would be a good pair of binoculars and an understanding that running around like a swat team badass doesn't always work.
Maybe I'm just nit picking. It does look entertaining.