The Australian system is certainly not without its issues, but it is far better than most other countries in the world, especially the madness of the US federal FPP system.
I suspect that this is why Australians are seen to be complaint/obedient. It’s because we know that half of us explicitly voted for this government - either directly or indirectly through preferences - and if it fucks up too much they will change their minds and this mob will be gone (and good riddance if you ask me).
I believe that this is also why Australian politics is quite centrist relative to many other counties.