Hmmm. Minty?

As far as standard goes, yeah, it's pretty good. Of course, the main thing that PhB has to offer is ASCs (Advanced Studies Courses) - I assume you've read up about that. The good thing for ANU kids is that the Research School of Physics (RSPhys) is full of people doing cutting edge research in physics, so you can easily do an ASC with a person from there, whereas a normal student wouldn't see RSPhys until Honours or more likely postgraduate studies. I had a friend do an ASC with a guy from there on nonlinear optics something something, and he helped come up with some groundbreaking result and so got to travel to Adelaide with his supervisor for a major conference, as well as being a coauthor of a published paper.
As well as that, it's quite possible to do ASCs with someone from CSIRO if you organise it (CSIRO's literally 250m from the Physics department, right behind Bruce Hall - we run up through it when we go for runs up Black Mountain

).
In terms of general physics courses, I imagine the standard wouldn't be too different from other Group of 8 universities; they'd all teach the content (up to the first two years) pretty similarly. As for third year, well I'm not particularly sure (I haven't done physics since first year...

) but take a look at the subjects
here for a glimpse of what they have. On the whole, I think it would come down to which type of physics you're most interested in, as each of the Group of 8 would probably have a different specialty that shows in their options for undergraduate subjects.