In hindsight, Australia can consider themselves rather fortunate that their tour of Bangladesh was called off last year. ;D
Of what I saw, Australia's batsmen looked as though they lacked a game plan. In fact, dare I say it, they looked very similar to England playing against spin. Even Steve Smith looked like a mere mortal out there.
Over the last 2 years, Aussie batsmen have shown an inability to play in swinging and spinning conditions. As soon as the ball starts moving, wickets start falling. I do wonder how much batting on flatter surfaces in Australia has hampered them.
Their bowling has still been very good overseas, it's the batting that has let them down. This is backed up in the numbers too. Over the last two years, Australia's bowling average in overseas Tests is 31.08. Only South Africa have a lower average. By contrast, Australia's batting average of 31.49 is fifth best. Good, but not elite like the bowling. Not surprisingly, Australia have the lowest batting average (23.42) in Asia over the last 4 years.
DownUnda can certainly speak to this more than I can, but I am not sure a Marsh/Nevill combination batting at 6 and 7 is good enough. What other options are there besides Nevill? Sam Whiteman, perhaps?
Not even modern-day Bradman could save them.