Firstly you don't need 11 great players to win a world cup, Pique is meh, Ramos frequently has horrific games at right back and isn't close to the best right back in the world, and same goes for left back.
What Spain had was balance, simple as that, Argentina don't have AS bad a defence are making out, they have a completely unbalanced OFFENCE, they struggled to score well in plenty of games over the past 6-8 years.
When you list Argentina's outfield you list, frequently, players who are all at different clubs, players who do not play together regularly, and with Argentina a CRAPLOAD of individuals and play makers, and not an awful lot of god damned hard workers. Pastore, Messi, Di Maria, Aguero, Tevez, you're listing a bunch of players who all like a lot of time on the ball and to be the ones dictating the play. Aguero and Tevez like to drop deep and pick up the ball, run at defences.
Milito played for years in a team that liked to lump the ball up to him on his own, while Messi plays in a team where the entire attack is always camped in the opposition half, intricate passing and playing off a striker, something Milito wouldn't really do at Inter.
Look at BY FAR the two best teams, Spain and Germany, you've got two teams who have entire sections of the pitch where all the players come from the same club, so play together 70 times a year, not 6-7 times a year in a constantly changing line up. Spain play like Barca, Germany play like Bayern, Argentina don't play like Real, or City, or Barca, or any one.
I mean look at England for balance, Gerrard + Lampard, lamps normally playing the deeper role and Gerrard being an individual who has zero discipline and goes all over(and despite the love of him from Liverpool, did Liverpool not get into their slump with a fit Gerrard, and go downhill under Benitez with Gerrard, and improve significantly without him?), no balance at all, no partnerships. Gerrard plays with a usually ultra defensive midfielder to balance their attacking style of play, Lampard did the same, England played them both, retarded. Now Lampard + Parker........ and you've got a pair similar to what both Liverpool and Chelsea had, Lampard came alive in the attacking role and Parker is better in the DM role than anyone we've stuck in there for the past decade.
It's NOT about putting the 11 biggest attacking/creative names together, which is basically what the Argentina side is, its about a balanced team with the right amount of balance, with enough creativity but not WAY to much.