Yes

Well, Messi. And by the way, he is not alone. Argentina brings us maybe the best 6 scorers today: Messi, Gonzalo Higuain, Carlos Carlito Tevez, Lisandro Lopez, Gabi Milito, Sergio Agüero.. and it's not all.. lopez for example, is not in the line-up at this moment. I can't see a team that could match this attack.
The second reason, well, its Argentina. Not many countries have the tradition or share the love to football as Argentina.

No 

Maradona. Yes, he was the best player ever stepped on the field. Yes, he loves the national team more then everything, but still, he is probably an awful coach. The 6-1 to Bolivia tells the story. Ohh, and he didn’t call riquelme to the team.

Bottom line - Messi will shine, but just until the semi final.