It's rare that I play a lot of courses unless I am travelling - living in Sydney generally means sticking to the home course with occasional forays to Melbourne, or a timeswap between my course and another. But playing in my club's Interclub team has meant seeing a bit more of Sydney golf recently.
The last 10 took six months:
Royal Sydney (x2)
Bonnie Doon (x>30)
St Michael's (x1)
The good: Royal Sydney is much better than I have previously given it credit for, though it's tremendously overbunkered.
The bad: Seeing how many of the city's courses are choking in trees and could be far better than they are with simple, cheap tree management (Killara is getting this right and making good strides).
The ugly: St Michael's. In-house design changes that don't fit, massive bushland encroachment, soft approaches and hard greens (this has become common there). It could be so great, but it's headed backwards, IMO.
A surprise: Avondale is very private and low-key, so it gets very little discussion as few people see it. The course is wonderful. Great land, subtle but interesting greens, width, ideal conditioning, smart bunkering. It reminded me of Newcastle in places. Worth seeking out for those based in Australia or visiting Sydney for a decent length of time.