I arrived 2 years ago and would quite happily never return to the UK.
What's bad here? It depends on you really.
I miss the online shopping and ability to find everything you need online.
Supermarkets here are tiny and run out of things. The oddest things have additives and the choice is much smaller (but when I went back to the UK last month I stood baffled in Tescos and thought 'why on earth is there 30 different types of wholemeal bread here?'). I think this is only noticeable because the UK supermarkets are so gigantic, we're used to having a warehouse full of stuff replenished every night. I prefer to use the smaller shops and it's much easier to do that here. I really miss M&S food halls though.
It's hard to get French wine . This is a problem for me but I'm sure nobody else cares that much!
It's miles and miles away. Your really don't realise until you get on a plane just how far away it is. Last month I flew back and we'd been flying for about 7 hours and I checked on the in-flight map and we were STILL flying over Australia. If you did that from London you'd be in New York.
If you still have to send money back to the UK it's hard on an Australian salary.
They are completely sport mad. There is sport everywhere. They talk about it all the time.
Australia is a wonderful place, it's beautiful, healthy and the people are just great. I hated London when I went back last month, it was crowded, expensive and the people were miserable.
It's worth remembering that nowhere is paradise though - if you come here you'll still have to pay bills, commute, pay car tax etc. The grind will go on, but at least the sun will be out, you'll be able to go to the beach to chill out and people will smile at you as you walk down the street.