B2N2,
I'm not against the training in the USA at all. However, what the OP "appears" to be doing is circumventing his/her national exams for the "back door" approach. That is, do the CPL in the USA and convert to the Australian CPL with only a couple of bridging exams. This is a potential "gotcha" - especially with the ATPL exams.
Some airlines (as stated by Tinstaafl) aren't happy with that.
Note, I did say "perceived" rather than "actual".
I know the USA has a very rigorous recurrent assessment.
Also, in Australia, your first job is generally instructing or bush charter (not unlike the USA) but who's going to recommend you or form those essential contacts if you've trained in the USA?
However, if the OP's intention is to work for a few years in the USA then all of the above is irrelevant.