There seems to be a real short-circuit in the midfield for me. It leaves the front three rather isolated in their runs. I thought Lavezzi started out strong, managing around his defender and just outpacing/muscling his man out. Tevez got off some shots, but wasn't too much of a threat. Messi was marked almost out of the game, unless he dropped back past midfield.
Mascherano spent the evening looking like Busquets - dropping in between Milito and Burdisso, making it almost look like a 5-man defensive line.
I appreciate Batista trying to run the BarÃ§a offense, but it's just not working. Messi's not out there with Xavi, Iniesta & co. - passers of insane quality who can hold their own on defense as well.
For all intents and purposes, I think I'd personally even play a different formation. Probably something more similar to a 4-2-3-1. I'm not quite sure either why Walter Samuel wasn't called up (I think he was injured for a long stretch last year, but he's still the most solid defender Argentina has). I am glad though that Demichelis has finally been found out for the flop he is.
Lone striker up top - I'd probably start with Tevez as a lone man up top for the time being. His goals at ManCity (inspite of having Dzeko as a partner) were usually crafted with him being fed up through the midfield and going at it alone from just outside the 18. Although with Kun Aguero looking all the more potent, this could be up for some debate. My personal favorite of the whole bunch is Gonzalo HiguaÃn, but with him having been injured for some 4-5 months, I'd rather start with someone hot.
3 "Attacking" midfielders (as a FIFA video game would describe it). - Definately put Di Maria in on the left from the start. He adds pace and width to any attack, beyond his ability to cut in from the wing for his own shot. On the right... I'd throw Messi back out to where he started. He was originally a right-sided player before Pep dropped him into the center of the pitch over the last two seasons. I'd have Messi moving up and down the right - again, speed and an ability to stretch opposing defense. He's a good passer, but the more I see Messi play in the center, I just don't think he's cut from that true "playmaker" mold, the way KakÃ¡ (in his prime) or Zidane was. In the center of the pitch, I'd have two different options, depending on the game. If I'm looking for more immediate firepower I go with (most principally) Tevez, shifting HiguaÃn or Aguero up top to start as the striker. Tevez @ ManCity is prone to coming back deep to pick up the ball, so he can cover ground. He's also played this position at ManUnited when Rooney was set up more as a lone striker with Ronaldo and Giggs out wide - Tevez would play supporting man. In times of more possession or flooding the midfield, I'd start Pastore. He is
the type of guy to kind of dictate what goes on through the center - something Argentina has been missing since Riquelme copped out.
2 more defensive midfielders - Mascherano is a fairly obvious start as one, but here you could probably get away now with fielding Cambiasso as well (who still isn't completely back from injury, it appears). Or, you could field Mascherano with Banega, with Gago, etc. A lot of Arg's midfielders play that role. Banega is probably the most versatile of the choices - inasmuch as he could support well in extended attacks as well.
4 on the back line. I think Rojo has a bright future from what I've seen - probably keep him by default because of the severe shortage of left-backs. Heinze could still play, but you want someone young like Rojo getting prepped for Brazil 2014. I think Milito's time has passed (being a literally unused sub for BarÃ§a through all his injuries and already in his 30's). I'd probably try to milk one more tournament from Samuel, as already stated, but otherwise I'd start Burdisso paired up with Spartak Moscow's Nicolas Pareja - he and Rojo already have a bit of playtime together. He's only 25-27 and brings a bit of height to the back line. At right back, I do love "old man" Zanetti, and think he's ridiculously consistant, and merits the spot, especially at 37 playing the way he still does. If not, you for sure throw in Pablo Zabaleta. I think the defense is where Argentina needs to focus the majority of its attention over the next three years. There seems to be a real drought of "world-class" defenders for the last many years.
Keeper - kind of goes to Romero by default, inasmuch he's the most experienced of the group. Don't know why Carrizo is in the squad, what with River having dropped to the B in the last week. Andujar I've never personally seen play. But I think in keeper consistency is key, so you leave Romero in until he begins to show he can't take it. I think Arg's tactical failings at South Africa 2010 were caused by Maradona's choices, resulting in the absolute goal-fest by Germany. I can't pin that all on Romero, even though he was between the sticks.
Anyways, just my thoughts for the day.