I read a few weeks back either Elvin or Buck saying that they didnt apreciate 'Unobtainium' from 'Avatar'. Im guessing you missed the point of it being called that, it was a post modern joke by cameroon on the plot, he knew the plot was weak and over done and over long etc. The film is about visuals and he used the easy plot to bring in the biggest audience, i liked the 'Unobtainium' ref because at least it made it obvious Cameron was aware of what he was doing.