I've just watched the whole movie .... I guess the expectations of a 5.1 track aren't really fair. The movie sits well on it's own with the 2.0 audio. After all, there is no way it was ever going to sound like Avatar. Yeah I am happy enough with it as it is after all.
After watching it, I was inspired to listen to my Simonetti Project CD, Mystery, Myth and Mayhem.