Do you think this integraded curriculum at UNSW will only prepare you to be a Doctor in Australia? What if you wonna take the USMLE's and practice in the US, do you think you will be get the proper education for that?
I would say that depends on what you are comparing UNSW to.
If you are comparing it to an American school like UCLA or whatever, then obviously no, UNSW doesn't train you to become a doctor in the US, since UNSW is an Australian uni preparing Australian docs.
But let's take a step back and look at doctors around the world. If you are comparing UNSW to other foreign/international schools, then certainly Australian schools like UNSW are top notch for training future physicians. Compared to third world nations, obviously most if not all Australian med schools tend to train better doctors. Compared to second world nations like China or some nations in the Middle East, I would still think Australian med schools train better physicians in general. After all, many Asians and Africans and Middle Easterners seem to want to apply to study in Australia, not vice versa (it also helps that English is the lingua franca of the globe, currently).
My point is UNSW and other Australian med schools can stand shoulder to shoulder with med schools of first world nations, including in Europe and North America. You will become a competent physician once you finish your medical training (which includes residency to attending physician in the US or consultant in Australia*). In other words, UNSW's future physicians are well respected around the world, including in the USA.
Having said all this, if your goal is truly to practice in the US, the best choice woudl obviously be to go to a US med school as UNSW will not train you for the USMLE, you gotta study on your own. That doesn't mean you won't have the knowledge to pass, per se, if you go to UNSW, as UNSW does provide basic science courses, and arguably more so than 4 yr grad programs (but this is arguable), but at the same time, you have be aware that it does not train for the USMLE.
Also, how much do you want to end up working in the US? If you simply must work in the US, and if to you nothing is more important, then it's best to spend the time upfront to get into a US med school than to study abroad at the UNSW.
So enroll in a post-baccalaureate program if you didn't take the prereqs, or join the Peace Corps or some other humanitarian program if your extracurriculars aren't up to snuff, apply to US med schools that might not require as high MCAT scores, etc. Basically do whatever it takes to present yourself with the best foot forward, with the best application to hoepfully get into a good US med school. Even though it seems like more time spent upfront before you are even admitted to med school, in the long run, it may make more sense if you want to work in the US. You may actually save yourself more time, perhaps, if you spend the time (years) upfront trying to get into a US med school and hopefully getting into one than if you have to worry about studying in another country, taking the USMLE, hopefully doing well enough to get into a speciality you like, and all the other hurdles or heartaches you might have just to come back to the US.
Again, this is assuming your goal is to pracitce in the US, and that it trumps all other considerations or priorities.
But if you have other things you want, like you really want to study overseas and don't mind going through all the hurdles of getting back to the US, then Australia and the UNSW in particular is an excellent choice.
It depends, again, ultimately on what your goals and what your priorities in life are. For example, is it a priority for you to work in the US or are you ok if you end up working and living in another nation such as Australia? Do you want to enter a competitive specialty like general surgery or are you ok doing another specialty? Those sorts of questions.
This is just my two cents, so please take it with a grain of salt.
*One thing to keep in mind though, is that Australian doctors have a longer residency than say American doctors. Generally, it takes longer to become a consultant in Australia than it does to become an attending in the US. But the Australian consultant should be just as competent a doctor as the American attending which is my main point.