How "sophisticated" Australian films are ? Perhaps you could learn from our banking system, which doesn't allow "cowboys" to destroy the economy and put millions out of their homes, and lose their jobs! As for the accent - awfully sorry, it is an Australian film made in Australia with an Aussie cast. When our actors come to the USA to work they adapt - I suggest you do the same.
PS Next time I see a USA movie or watch an American TV series, eg The Wire, do they speak English ? The rest of the English speaking WORLD can't understand them.