I've watched the Aussies play S'pore, and I think their defence is terrible! If S'pore can run rings round them, I'm sure the better teams can do better.
The understanding between the defenders is poor, and you can see 2-3 players drifting towards the wing, which then left quite a bit of space down the middle.
If only S'pore had their scoring boots on that day, the results would have been different....