Anyway, I've gone to live overseas a couple of times now. The most recent time was to the US 11 years ago. I'm still here.
As many problems as the US has, the one big selling point it has is career opportunities and earning potential as a software engineer. Like... it doesn't even come close. I'll take what my US compensation buys me in NYC over whatever compensation I could get buys me in Sydney (in particular).
Property in Australia is like a game of musical chairs but the music stopped in Sydney in 1978 (in Perth and Melbourne it was more like 2003).
One thing I like about the US tax system is there is no negative gearing (mostly). Specifically if you earn over a certain amount ($150k but it starts sliding down at $100k) then you can't offset ordinary taxes with passive losses. I really think Australia desperately needs this system but negative gearing is so ingrained in Australian culture now that it's political suicide to try and change it. I believe Labor made noises about this in a recent Federal election and suffered the consequences.
It's a shame because Perth and even Melbourne used to have a relatively low cost-of-living and high quality-of-life. I honestly don't know how anyone does it now.
As for the politics, it's a bit of a mixed bag. Australia doesn't have the crazy evangelicals that the US does, for example. Like when the gay marriage issue was decided even the highly conservative former PM Tony Abbott basically came out and said the matter was settled and it's time to move on.
As for climate change, while I believe in it I also don't think anything will change out of pure altruism by any large group of people. And that's anywhere. It's not unique to Australia. Look at what's happened to the price of solar in the last decade.
I'd say the ugliest side of Australian politics and culture in general is actually the treatment of refugees and the so-called (this name still sends shivers down my spine) Pacific Solution.
Oh and we can't forget Australia's most pustulent export: Rupert Murdoch.