thumbwitch, Shells is right. It so depends on what you are after. My DH is totally happy here and wouldn't ever return to the UK (funnily most of my ex-pat Brit friends dh's feel exactly the same).
There are so many things that are 'better' over here, but they are the tangible things ie bigger cars and houses, better outdoor life, better climate, safer, better schools, less crime, people are friendlier.
However, for me, although i realise all those things are great, particularly when the kids are small, I really miss the buzz of life in the UK, the BBC, the newspapers, the different sorts of people you see - diff colours, diff fashions, diff attitudes. Most people here (in Adelaide - it may be different in Sydney or Melbourne) look the same - ie white, middle-class, and the whole media is bland. I miss being at the centre of things, i do really feel like we live at the edge of the world - I think the time difference has a lot to do with this - everything happens when we are asleep!
BUT as Shells says, the internet is AMAZING, I read the Observer on a Sunday and listen to Radio 4 still. Mind you I have NEVER felt like taking Crack Cocaine until I moved here, I think it's to do with trying to deal with the boredom .