Soccer is EXTREMELY skill intensive. Your legs/feet are "less coordinated" than your hands are. Dribbling a soccer ball is much harder than dribbling a basketball, especially while running at high speeds, or when there are players for the opposing team going for the ball trying to take it away from you. And passing or shooting a soccer ball accurately is far more difficult than throwing any kind of ball accurately. You can take someone who is an exceptional athlete and put him on a soccer field, and he'll suck if he's never played before.