The Australians lost the second T20 in Melbourne to give away an unassailable 2-0 lead to the visitors in the three-match series, the first bilateral triumph on Australian soil for M S Dhoni's men.
"We're just getting completely outplayed in all three departments at the moment, the bat, ball and the field," he told reporters at the Sydney airport.
"Their batters are in outstanding touch and have been all summer. We're struggling to get early wickets and get into their middle order," he added.
"They're playing exceptionally well, there's no doubt about that. I was pretty happy with our start with the bat, we were right on track but then spin again was our undoing in the middle overs," he said.
However, Di Venuto said he wouldn't consider the results so far as a setback despite the fact that Australia's next T20 assignment happens to be the World Championship in India scheduled for March-April.
"We've had quite a few debutants so far throughout the series. We've got some players resting or heading to New Zealand to prepare for that. The make-up of our side might be completely different -- we'll just have to see what the selectors come up with," he said.