I think Wanted Down Under does attempt to inject a dose of reality into peoples aspirations to move to Australia. The first is the length of the journey which you see in the first few minutes of the show and begins to sow the seeds of doubt. Next is the cost of housing - many who haven't done the research seem to think they can get their huge dream home for a fraction of the cost of the UK. They tend to be shown what they can afford at the budget they have set, something a bit more of a stretch, and then the 'dream home' which would require both working. Lifestyle is always popular but then jobs and cost of living are then analysed. For some that's the killer, when they discover they'll be worse off. Finally it's the family videos from back home, or what I term the 'Emotional Blackmail' element. That's what puts a lot of people off, when they realise how far they'll be from friends and family. The families vote in each element, and then have a final vote whether to go or not. Often it is the older children who vote to stay in the UK.
My favourite episode was one where the mother had been pushing for years to move over, but the father and children were against it. The mother found it didn't live up to her expectations and turned against the idea, while the father and children loved it and wanted to move!
We've only been here in Brisbane since October and love it, despite it being so chilly at the moment. However, we had no expectations and Australia had never been our 'Big Dream' - we just had an opportunity present itself and took it. What I liked about Wanted Down Under is that it does tend to show people who had the Big Dream that the grass isn't always greener.