There is a general feeling, already noted here, that this film whitewashes Scott and turns him into a heroic figure. This is not surprising when you consider that when it was being made survivors of the expedition and relatives of those who died (particularly Kathleen Scott) were still alive.
Nevertheless, the film does raise some questions about Scott's leadership and judgement: his desperation to be first at the Pole with inadequate planning and resources; his last-minute decision to take a fifth man to the Pole when supplies had been calculated for a four-man team; the fact that none of these questionable decisions are challenged by subordinates bound by Royal Navy discipline.
The scenes at the Pole are particularly telling. When the British reach the Norwegian camp it is Wilson who enters their tent, while Scott tells Bowers to "check the position". Wilson's look of disgust emphasises Scott's refusal to face hard reality at a critical moment.
So, yes, this is the story of a "national hero", but watch it with care and it is far from uncritical.