The closing minutes saw both teams push frantically for a win, with All Blacks captain Richie McCaw calling an attacking play at the death as the World Champions looked to keep their winning streak of 16 Test wins alive.
However an All Blacks team that looked something of an imitation of the side that had carried all before them in 2012 so far, and this was reflected by Hansen's simple assessment of the match.
"Too many avoidable penalties. Too many avoidable mistakes," Hansen said.
The All Blacks coach did give praise to the Wallabies, who put in one of their better games of the season.
"Some of those mistakes came from pretty good play by Australia, but others didn't," he said.
"That was one of the ugliest games of rugby I have ever been involved in."
The All Blacks now turn their attention to the Air New Zealand End of Year tour, with Scotland the first team to meet a New Zealand team that will leave Brisbane with few positive emotions.
"We are obviously really, really disappointed," he said.