lecturers tend to rotate or may lecture at various unis concurrently. Just like school teachers its not easy to comment on the state of the teaching as a whole - it's luck of the draw.
The economics faculty always has rotating, visiting teachers from overseas, which although good (they're very knowledgeable), when their english isn't, well, perfect, it can get a bit annoying
My one at the moment though is french, and is absolutely brilliant (and her english is fantastic as well!). Though I can no longer say macroeconomics, its more a "mac-roe- con -om -ieeeeeeee"
Its more important to look at content of the course, because realistically usyd and unsw have the most money to get good teaching staff, and lecture notes on the web can usually suffice in the direst of instances. Check out
www.econ.usyd.edu.au to get synopses of the courses available and major programmes. I can't remember the equivalent for unsw, but i know i found it really helpful to look carefully through each of the courses to see what was offered for each (or, more accurately, to get my dad to do it for me and then explain it because i didn't understand half the jargon
)