So much facepalm.
Ponting isn't leading the side from first drop anymore because he's been crap at it in the last 2 years. With Watson pretty severely out of form why the hell would you retain Ponting at number 3 when he's pretty much a walking wicket as well? Ponting at 3, combined with Watson and Hughes not being in good form is asking for trouble, and recent Australian Test history tells you it's pretty ****ing hard to consistently win Test matches when the first 3 wickets fall for next to **** all.
Clarke is at number 5 because that's where he bats best. As he's the captain, you shouldn't be ****ing around with his form by shunting him about the order to satisfy some bat**** crazy notion about "leading from the front" because that's what Ponting did for 7 years. Steve Waugh didn't lead from the front, nor did Allan Border. Clarke bats best at number 5 and has just peeled off his second consecutive Test ton in the position. But no, let's shunt him up the order to number 3 - where he has played a grand total of 1 Test inning - to satisfy your spurious notion of what good leadership supposedly is. The best thing a captain can do is lead by example; Clarke does this at number 5. So he bats 5. When your batting has been as weak as Australia's has in the last couple of years, why in the name of Christ would you move the one person who's actually started to perform well again in a position where he's always performed well?
For Hussey, pretty much see Clarke. In dire form for 2 years at number 4, is moved back down to 5 for the Ashes, starts performing well. Moves down to 6 to accomodate Marsh in Sri Lanka; continues to perform well. The same principle about not ****ing around with components of the batting order doing well that applies to Clarke equally applies to Hussey.
The batting has been weak because Australia for years have carried underperformers. At the moment, Hughes (with the exception of his ton at Colombo), Watson and Ponting aren't performing. When 3 of your top 6 aren't performing, then obviously the batting will look a little bit suspect. The solution is to remove the underperforming players and replace them with better replacements (as Marsh has been so far at number 3), not moving your players to positions in the order they aren't comfortable with under the guise of "experience", which is just ********.