I travel as a pax into Sydney frequently and it is appalingly bad. I suspect that the International facility is not designed to handle the current passenger volume. I have arrived in YSSY on a Friday morning and it is pure third world stuff. I have frequently visited Thailand, China, Japan, Germany, Holland, Indonesia and the United States. ALL are better than Sydney without exception.
One day out bound, the immigation line went out into the terminal, between the checkin counters to the front door on the terminal, unbelievable!