Andrew Marr's 'The Diamond Queen' is entertaining, but its hardly a documentary, and even less an examination like he claims. I'm a Finn, and for someone with no emotional or personal investment in the Queen what so ever, I found this series reeking like a prolonged promotional video for the British monarchy. I think there's nothing wrong with that, as long as people understand it and can then choose whether to watch it or not.
Like presented in the plot summary above, Marr tailed the Queen for little over a year around the world. He had virtually unlimited access to the royalty, politicians and other insiders. The series features multiple interviews with different protagonists around the Queen. Everybody praises her without exception. All criticism and objective studying of the monarchs and their actions throughout history are absent.
I liked the show because it gave a peak to the public day to day life of the Queen. On the other hand I was disappointed for the absence of questions and objective criticism from Brits who oppose the monarchy. I recommend the show to those who either like her or have at least neutral views on the matter.