Well, Madrid is not playing Robinho enough...
But remember in the confederation cup how important, not how good, but how important Robinho was, although he don't score like Adriano and maybe Ronaldo, but then he works great in the team as a linkage between the midfield and Adriano, kind of like having half a Ronaldinho and half a striker there. Brazil is having enough attacking power, having Robinho and using him the way he was used in confederation cup, can further strengthen the midfield and maybe even allow more room for defence. Think about the last worldcup and think of Rivaldo, Robinho is the guy to play that role.
But then I guess world cup is all about stars, the game has changed...