Personally, I really liked the Canadian series Ancestors in the Attic, except for the antics of the host, which he tamed down in the last several episodes. The mysteries they worked with were from ordinary people, not from celebs or public figures with oodles of money to spend on research (if they paid at all). This series was more helpful to the average genealogist as they worked through many ways to find information without it be laid out before them. They explained what was available, how to access it and where to go next.
Who do you think you are? is not bad, but then again celebs with all the research being done for them. There is no real connection between the principle and the process. The stories are good and the emotions are probably real. I experience the thrill of discovery myself from time to time, but still have more questions than answers.