I certainly did the SYD-ADL-SIN route with QF, and didn't mind it at all. I was less impressed with SIN-PER-SYD on the return, but not because of any concerns with PER, but because it meant you spent pretty much a whole day travelling SIN-SYD. So I can see where our brethren from PER don't much fancy a SYD hub, but I am not sure it should be seen as a great hardship for ADL/MEL pax to travel through SYD. In Europe and Asia people accept that you can't always have direct flights, and need to transit hubs, whether it is LHR, CDG, MUC or FRA for a major European ariline.