Well maybe the Brits should've colonised Australia a century or so earlier, then we'd also have 350+ year old houses. 
How daft.
I've stayed in Aus for a longish period.
Can't be that long, because...
People don't go out in the lovely weather. It's too hot and to dangerous because of the risk of skin cancer.
Load of tosh. It was 40 degrees yesterday and loads of people were out. The general "rule" is you don't go to the beach in the middle of the day, but people aren't holed up indoors.
It has horrible insects and animals that can kill you.
Load of tosh. I live in the country. 100 acres. Have never been so much as stung by a bee, let along bitten by a spider or snake or smacked down by a kangaroo.
It's too far away from anywhere. I can drive for 6 hours in Europe and change culture, architecture, money (ok not so much these days), food, language, scenery.... several times. In Aus I wouldn't even have reached the next city. So not only is it isolated as a country, people in the country are isolated from each other.
What's "too far away from anywhere"? Australia is the size of the mainland United States. You could spend months traveling around it. You couldn't do that in the UK. The culture, dialect, food, scenery changes everywhere in Australia.
The TV is crap - loads of v old BBC programmes.
Free to air is a relic now that Netflix etc. is here, so hardly relevant.
There is nothing historical to see older than 200 years. The Aboriginal people leave little trace of themselves.
Might be because the Indigenous people were nomadic, and because Australia wasn't colonised until 1788.
But it is one of the oldest land masses on Earth, with the oldest rocks etc. being found here. It has plenty of history.
It's becoming very Asian - which is not a racist remark, just an observation for people who think Aus is "Britain in the Sun".
Yet Australians are the racist ones? 
There is no Amazon next day delivery - the country is too big with too few people to make it viable
Oh wow, what a reason to write off a whole country.
The centre is becoming a dumping ground for toxic waste.
In the words of Pauline Hanson: please explain.
You can only safely swim in designated spots because of sharks.
Load of tosh. This only applies in far north Queensland and the northern parts of the country in general. Plot twist, the vast majority of people do not live in those areas.