For the most part, Australian schools evaluate you on your GPA and MCAT only, with the exception of a few portfolio schools they do not care about anything else including extracurriculars or personal statement. If you meet their requirements, they will offer you an interview, and if you interview well you can generally be admitted. If you have a good MCAT, it is not difficult to get admitted to most Australian schools.
Why Australia though, what's your goal with this? If your primary goal is to come back to the US then Australia wouldn't be the best first choice. I'm a current student in the UQ-Ochsner program that wysdoc mentioned and also was accepted to several Australian schools. Happy to answer any specific questions you have.