John's review has it pretty right. This is a great film but it's even better when you know well the landscape in which it is placed. That landscape is at least as good as shown in the film, if anything even better. It's one of the very beautiful places of this earth and so accessible - see below.
John's conclusion that it is "a wonderful colourful look at the Australian Outback and its early pioneers as a bonus" is a little wide of the mark. The Blue Mountains in which "Sirens" is set are less than two hours drive from Sydney and Norman Lindsay's house and land where it was all filmed is just over an hours drive from Sydney - hardly "the Outback" !! The house is now a Norman Lindsay museum - his paitings alone are well worth the visit - and the grounds are pretty much as seen in "Sirens".
As for "early pioneers" it is based on events that took place in the 1920s - hardly pioneers, other than in social attitudes !
But all of this just makes the Blue Mountains and Norman and the "set" for "Sirens" all that much more accessible for anyone visiting Sydney.