I found this "documentary" to be utterly biased in favor of the immediate royal family, while placing people like Princess Diana and others that married into the family as a cast of characters that were out to destroy their magical kingdom.
Princess Diana was painted as a depressed, self-obsessed, out of control child that came from a damaged home, not suited for Prince Charles; going as far to state that she was actually out to destroy the royal family. While Prince Charles was painted as the poor little royal boy that just got caught up in marrying the wrong woman; whilst having an affair with Camilla. Give us a break!
Let's remember that Princes Diana was not "unsuited", or a "commoner", as the royal family would have us think. Princess Diana came from an aristocratic and noble family, The Spencer's of Althorp, dating to the 15th century.
This documentary is a sad and clear attempt to steer the viewer into seeing the immediate royal family in a brilliant white light, while casting dark shadows on others that did not suit their own personal needs.
I feel bad for Prince William and Prince Harry, having to see their mother berated, stripped of her dignity and used as a scapegoat in such a fine royal manner.
File this "documentary" under "Mostly Royal Fiction".