The FPS-style training games the Canadian military use have been very successful. I know this because I've chatted with people involved (my school provides many of the development staff in the form of grad students; programmers and artists, the military provides the designers and subject matter experts). In particular, one sargeant in charge of the more normal, "old-school" training was very impressed by the difference in soldiers he recieved for training who had taken the game-training first before being sent to him, as opposed to sitting in a classroom listening to an instructor before going out to the killhouse. What the games teach is not the physical aspects of toting around heavy rifles and firing them accurately, they instead teach the soldiers about things like proper tactics for clearing a building room-by-room, floor-by-floor. These games have built-in features like comms procedures and hand signals. The games are not just a minor improvement over static lectures on tactics, they are a major improvement.
