Don't you have to score more points than the opponent? >_> I really hates sports so I don't know. But how can you win if you don't score?
Basketball is a team game, and different players have different roles. A player like Allen Iverson's role was to score as much as possible. Dikembe Mutombo was one of the greatest defenders and shot-blockers of all time, and a damn good rebounder as well.