A sizeable number of people that I played with went on to serve in the military, evidently due to their experience playing the game. So, anecdotally, it was effective.
Strangely, the one thing that sticks out to this day is they shunned the convention of using red and blue team indicators and instead chose red and green which made the game strangely difficult to get used to. I think I am remembering those little tick icons hovering above a player or maybe the reticle.
I guess the reason I'm pointing this out was because at the time I kept thinking if they can't get this one simple thing correct, what plethora of other things are they getting wrong.
edit: I have no idea how this adds to the conversation. Just thought vomit I guess.