The results are in: the premiere of “Who Do You Think You Are?” was the second most popular NBC television show on Friday evening, only a tenth of a rating point behind “Dateline NBC” which followed.
“Who Do You Think You Are?” had 6.9 million viewers overall while “Dateline NBC” had 7.2 million viewers overall. The information was provided by Nielsen Media Research.
I'd say that having 6.9 million viewers watching a program about genealogy was a success!
You can read more details and numbers at http://www.rbr.com/tv-cable/tv-cable_ratings/22037.html.