I think the problem with Argentina is that the players dont understand each other and are all way too selfish in being the key factor into winning a game.
remember this nutmeg:
Then pastore followed that up by shooting himself completely ignoring Messi who was free to tap into an empty net. You would never see that at Barca.
This team needs to be built around Messi, not its just him dropping deep setting up the attacks which they continue to fuck up by making the wrong decision or not passing the ball back. Worst is Messi ends up being the least selfish one yet getting all the blame while the otehrs are hailed as good quality players.
What you can blame Messi for is lack of leadership(dictatorship) and going into a shell at times when the going gets tough. He should have put them into their place and demanded to be the vital point of the team. Maradona sure as hell would have.
But then again since Messi is no real leader, it would be best just to make Mascherano captain and have the coach make the system work by demanding an unselfish supporting role from the others in midfield/attack.