"Next Goal Wins" is an irresistible underdog story - sports-fan credentials not required. The lively documentary follows the biggest loser in international soccer as it tries to break a 17-year winless streak. To use the word "organization" is putting too fine a point on it: The team in question resides in the South Pacific territory of American Samoa, and the volunteer players are about as far removed as you can get - geographically and every other way - from the business of high-profile, high-stakes athletics.