While Kranz' book often comes out as overly jingoistic and with an excess of pathos, this documentary strikes a good balance between depicting the historical background of the space race, the technical issues of spaceflight and the emotional impact on Mission Control personnel.
To people very familiar with the events of US manned spaceflight in those years, there is not much new information to be gained from the documentary. There is Conrads difficult Gemini spacewalk, the Apollo 1 fire, Apollo 8 going around the moon, the Apollo 11 moon descent crises (Computer alarm and low fuel), Mission Controller Aarons reset of the Apollo 12 during launch and of course the whole saga of Apollo 13. All is told through the eyes of Mission Control, its directors and controllers, with the astronauts only appearing as fuzzy voices on the radio downlink.
The strength of the documentary is that it shows us the faces and voices of the Mission controllers. From the perspective of 2003 they re-tell their stories in a seamless narrative illustrated with mostly original film, but also a little re-enactment, which happily is not too intrusive (even though it does show people watching a Mercury launch in colour on their home TV set..). The contrast between the young faces filmed in the 60's and the present-day aged and haughty demeanor of the same men is a captivating reminder of the passage of time. Working in Mission control was obviously the high point of their lives, so there is a slightly nostalgic note to their account.
Some things about the documentary can be criticized. Space buffs will miss technical details, and not much is being said about the system of shifts in Mission Control, that is, how "colourcoded" teams managed the job of mission control 24/7. Also, the focus is very much on the telegenic Gene Kranz, to the detriment of the other mission directors and controllers. This is probably unavoidable when we're dealing with the TV medium, which needs easy-to-follow stories and a captivating protagonist.
If one wants a true insight into NASA mission control, one has to read books about it. This documentary will however serve as a primer, and a good one at that. It is emotional to hear the story of NASA's crises and triumphs, re-told 40 years on by the men who were actually there. They might not quite be unsung heroes, since their feats are well-documented, but they certainly deserve to be heard once more by new audiences.