Australian Med Schools are in flux at the moment. It's a VERY recent development of the post bachelor degree med school there (within the last 5 years), and the overwhelming majority of their students are still going through a Commonwealth/European format to medical education. Whoever said their MD's are getting compensated the same as US MD's has no idea what they are talking about. Much more in line with salaries in the UK.
As someone else said, the Match is only going to become more and more and more competitive even for US grads going forward. And while I agree that the education one will receive Down Under is superior to a Caribbean education, I'm not sure that'll result in improved success in the Match. This is for a couple of reasons - 1) as mentioned - lack of US clinical experience which many residency programs in the States look for from their IMG candidates and 2) lack of name recognition. For better or worse, the places willing to take IMG's have experience with certain schools. It's a fact of life that if one resident from XYZ med school does well at 123 Residency program, the path for subsequent grads becomes easier - that's as true for US Grads as those from the Caribbean. Because of the difference in educational formats between the US and Australia, there's a lot fewer Aussies who have made the jump, and so despite the higher quality, it may not translate to better match chances.