Australia has always struck me as the best ally we never knew we had. For some reason, I don't know why, Australia seems to be disproportionately supportive of the US at both the grassroots and national government level.
Australian troops have always struck me as eminently professional, albeit that seems to be a cultural thing among all Commonwealth troops.
My usual weekly interaction with Australians is through the internet via gaming on Australian servers, and I usually have to quit the server because I can't stop laughing; to the point my stomach is hurting. They always seem to have this drunk redneck sort of personality but with a very advanced sense of humor.
Overall, my impression of Australia is a great country that is a perfect example of why our Bill of Rights are both unique and very important. Truthfully, I'm not well read on the goings on in Australia and would never try to qualify that opinion or share it with anyone if I wasn't first asked to.
I can't really share more without just repeating things I've heard.