Argentina are short on midfielders who can keep the ball and make smart, good passes so Messi is constantly having to drop deeper and deeper to help bring the ball to the attack. In the second half, he was playing in the midfield, not as a fals 9 or dropping back so often, that was his position after Cambiaso left. I thought he played well but couldn't get on the ball enough in the attack. The wingers, until Kun came in, did absolutely nothing. The lineup in the first half kind of worked as they created some decent chances, but maybe start Kun and Lavezi on the wings to keep the game wide. Tevez wants to go central too often and was killing space instead of opening it up
The problem is not attack though, it's the midfield. Banega was losing possession constantly and making poor decisions. Cambiasso was nowhere to be seen and Mascherano was having to cover everywhere.