How would you say Australia stands in the game currently?
I know you were asking Milurian but given a couple other people have answered already I'll also give another opinion as an Australian (not that everyone here hasn't heard mine multiple times lol).
Marvinb pretty much hit it on the head in regards to Australia being very well fleshed out from an international perspective (which I think is what this thread should reflect), but still very lacking from an Australian standpoint, to the point where it is still by far the most underrepresented region. A good way to contextualise this is by looking at
this thread I made a little time ago on mammals kept in Australian zoos (before Zootierliste went international, though the holdings for Australia on ZTL are still incomplete for many species and zoos) - of the missing species that are classed as common (more than 10 zoos), 21 are native whilst only 11 are exotic. Of these exotic species, 7 are New World primates (we can all agree there), two are domestic glires, one is the serval and the final species is Goodfellow's tree kangaroo, which arguably qualifies as Australian anyway. Among the Australian species are quolls, bilbies, hairy-nosed wombats, possums and a multitude of different macropod species, and those are just the mammals - you can imagine just how much is missing once reptiles and birds get involved.
Obviously Planet Zoo isn't going to get to the point where it's possible to replicate the abundance and diversity of native species found in Australian zoos, and there shouldn't be an expectation for it to - after all, we're only a tiny fraction of the player base down here, and we already got far more than I ever dreamed we would get after the Australia Pack. I'm very grateful for that. The three most important missing "essentials" for Australia from my perspective are the short-beaked echidna, a tree kangaroo and a monitor lizard (shout out to bilby and rock-wallaby), and I'll be absolutely overjoyed if we get any of those before the game ends, as well as any other Australian species they could possibly throw at us. What we don't get officially I'm content with modding in as long as a good quality mod can be made for it (unfortunately not the case for some of our more unique species, but having animals as simple as hairy-nosed wombats and grey kangaroos make such a huge difference for me).
Honestly, as I've lamented many times, what's even more critical for Australia than more animals is more plants - if Frontier squeezes another eucalypt into the game before support ends I will give them my firstborn child.