Sorry, I just saw this on the home page just now. Not sure how I missed this before...
Overall, I thought it was just "okay". The music did not fit the film, I thought they were trying too hard. I had my doubts on whether he really ran the WHOLE thing. Sort of suspicious when the rest of the crew (his other son and friends) dropped out. I admire Terry's tenacity of accomplishing his goal but question whether it was worth risking his health/life? when his kids already lost a parent.
Also, I don't think I would have called it a "marathon" or " marathons" in 75 days. Otherwise, I think he would have lost a significant amount of weight. Just my 2 cents worth.