I think as family history researchers, we tend to view these programmes in a different way to the ordinary television viewer who is watching to while away an hour.
If you are not that interested in finding your own FH, these programmes provide an hour of entertainment.
For us, they either fall short of expectation or we can see what could have been done to further the research etc etc.
As a child I knew all my grandparents and three of my maternal great-grandparents. My husband, like Rory Bremner, never really knew his father or either of his grandfathers, they all died at an early age.
Each programme does give a little more information on a particular aspect of FH and clues to help with our research (although I must admit, I shall be watching the re-run tonight as I tended to miss bits towards the end - dozed off

Pat ...