Oh, I dunno. In how many other armies is an ordinary troopie trained to operate a radio? In how many other armies is an ordinary troopie trained to call in artillery and air support?
You'd be surprised. Your typical Western grunt is a better fighter than your typical US grunt. It's the reason why other countries still manage to routinely beat US at wargames, despite inferior equipment.
That's not to say the US doesn't have good fighters, since they obviously have elite units, but that's not the emphasis.