Now I am seriously doubtful that Marvel expect to make back their $150 millions dollar budget back from Australia alone. No I'm talking about the critics
By now a lot have people have already decided if they will/won't see this movie. So as of now MARVEL is pretty much guaranteed 'X' amount of dollars on opening weekend. But with THOR opening in Aus a full 2 weeks before the USA, I can only see problems arising. Now there are many movies that open in Australia before the hit the US, one example is Green Lantern. Green Lantern opens in Aus 1 day before the US, so even if the movie is a total disaster word wont spread fast enough to hurts its earnings significantly.
But THOR will have been going for 2 full weeks! The critics are going to go hell for leather, they will it all they've got. So if THOR is an absolute mess there is plenty of time for word round the internet to spread, reviews to be read, television reports ECT. With mass movie review sites like Rotten Tomatoes and Metacritc im sure how good/bad the film is, will spread like wildfire. This intern could kill any chance THOR had at being a box office smash. Now I'm not saying that there hasn't been bad movies that make loads of cash, but the fanboy community is very vocal and can change the tide for CBMs.
But things could go the other way and because of how well its received in Aus, it is HUGE in the US. This is only my personal opinion of course, to me THOR looks amazing and should do well at the box office.
Please leave your thoughts on the subject, in the comment section below and have a great day :)