Australia has given it a good go, the Argentines have been almost as bad as as they were against Poland, yet there's nothing remotely surprising about Argentina leading 1-0 thanks to Messi. Argentina will likely come into it more in the second half, like they did against Poland, once the Aussies decide to come out and try and chase a way back into the game.
This Argentina side is pedestrian. There's no real zip in Argentina's play, they don't close down particularly well, there's nothing very special about them besides one man: Messi. Compared to the Argentina teams Messi has played in, with players like Zanetti etc, this may be the worst one. If he can drag this team to winning the World Cup it'll cement his greatness. It'd be like an artist making a masterpiece with crayons.