I know that my review is contradictory, because my concern is about the message of the film, and one of the highlights is also the message of the film. This is because it is clear from the reviews above that one of the primary messages of the film is lost on people who are watching it.
I think one of the most powerful messages that this story teaches is that while there is beauty and adventure to be found in nature, the real natural world is even harsher and more unforgiving than the industrial world, and the same struggle of power and greed repeat themselves--to and even more astonishing degree--in the natural world. In fact, Chris' assertion towards the end of the the film that true happiness is not found in human interactions is quickly dashed to pieces after 4 months in the Alaskan wilderness, at which point he writes that happiness is only possible when shared, or something to that extent.
The film truly highlights the power of human interaction, and that enjoying nature fully can only be achieved when we have the support and love of other humans around us.