Gaming doesn't make you into any kind of super soldier at all. On the contrary, if you've played games on an easier difficulty, you would probably end up a raging maniac, storming in the crossfire and getting hopelessly shot down. It might be possible that you would have a corrupted idea of the real risk involved in actual combat. A grenade? Just move 3 meters away from it and you're safe.. *BOOM* shrapnel in the face :/
Though I think you do learn some useful things if you play the right way. People who play Call of Duty 4 on Veteran (or whatever the highest difficulty is), or other tough FPS games, know that it is often better to get good cover, and take your time measuring the situation. You have learned that it is unwise to carry a spent clip in your gun, and you'd better reload after having fired a few shots, or when your gun is jammed. You will wait for your buddies, instead of charging in alone. You run like hell from grenades, and don't throw them through tiny windows in fear of them bouncing off the window post in your face. You don't stand in sight of a heavy machine gun or enemy tank. You don't stay in the same position after firing your gun. You fire short bursts, instead of emptying your clip at once. You aim for the head (or legs/arms), instead of the armour. If your rifle is empty, you quickly get your pistol to defend yourself. You are always on the lookout for hidden enemies and snipers when walking around. You never just go around the corner without knowing what is behind it. You cast stoneskin before every battle.. Oh wait :/
Not saying that I'll be a good soldier if I'd join the military, but I have learned some useful stuff while gaming. My reactions have increased too (though of course I don't know what these are worth in actual combat). But to say that I have learned nothing..?