I lived in Oz for two years before I had DD and I wouldn't choose to go back. I started off loving it, I was backpacking, hanging out with others in the same position and it was a great big holiday, I only saw the good stuff, the stuff we dream about in the UK, but then I started working and moved to a real Aussie town (Kalgoorlie!), and though I had a fab time, and I'm glad I went I noticed far more of the bad points, all the things that have been mentioned here.
I know as a typical English person I do moan about the weather but it came as such a shock. Too hot to go out so you can't enjoy the sun, lack of greenery because of it and I hated the winters. Of course it's warmer than here but lack of heating and insulation left me freezing for 3 months, and you don't get the cold nights where you snuggle up inside the way you do here. Christmas seemed all wrong, (I called the radio station on Christmas day to ask where the Christmas songs were!) and no long, light evenings in summer either.
Living inland there was no beach, though of course most people do live near one. I didn't think the food was as good as here, fantastic asian food but no where near as much choice as what we're used to.
The telly is beyond rubbish, and I found that made a difference. Over here we do all bond over Eastenders/Strictly/X Factor and have fantastic documentaries/drama/current affairs programmes. They just don't in Aus, and international news is very lacking.
Oh and you get bizarre adverts for something like a roadhouse 10 hours drive away, followed by one for a Thai restaurant, 6 hours in the other direction!
I missed the history, the old buildings, castles and cathedrals, the green countryside. Red dust worn thin very quickly!
None of the things I didn't like would have occurred to me before I went, but they are things I take for granted in the UK, things I didn't notice until they were gone.
For me Australia felt like a very small, isolated town 20 years ago, and given that I did live in a small isolated town there you could say it was 40 years ago.
It has a lot to offer if it's what you want, but it really wasn't for me. Two years was enough, and I wouldn't have missed going for the world, and since DD has duel citizenship I may find myself back there one day, but I know now that it's really not the place for me.