The present aussie team is not as strong as the team which was under Steve Waugh 4-5 years back. Their bowling has been weakened compared to what it was earlier. They dont have have Warne and Lee in the team. Moreover most of the time its Hayden Gilchrist and Ponting who did the damage in teh present world cup. If any team can get top 3 out within frist 10 overs then their middle order is exposed which is not much experienced except Symonds. The only reason why other teams failed to beat them till now in this world cup is bcos nobody has strong bowling attack. Srilanka and New Zealand both could have beaten them if they had played Murlitharan, vaas and Shane Bond respectively.
