Billing this as the life of the band is a bit misleading. Let's see it more as a tribute and celebration.
The producers initially run into a big problem. As noted, Kraftwerk are reclusive – they don't do interviews. And, most of their seminal work was in the mid-late 1970s and was only noticed by an inquisitive few. So not many people available to track the life of the group.
We get Paul Morley (fan, music journo, record company exec, all round authority), Francois Kevorkian (legendary remixer and member of the "inner circle") and Derrick May (co-founder of Detroit techno and much influenced by Kraftwerk). We see different aspects of Kraftwerk's output (the music, the art, the influence) with these three chipping in along with other contributors.
It is a bit difficult to take all the gushing praise (especially from Morley) however there is value in seeing/hearing all the group's works gathered together and assessing the relevance they have today. I'll leave it up to the individual viewer to work out what we would not have today without Kraftwerk.
While I did get irritated by aspects of the programme I also enjoyed the overall presentation immensely. Not a huge fan (or huge disliker) of Kraftwerk it was a good opportunity to see how far ahead of the game they were back in the 1970s. Some would say they wrote the rules!