RETROSPECTIVE: Best in TV: The Greatest TV Shows of Our Time. ABC, CHCH, 9 p.m. Never mind debating current political issues or the foundering economy. The real questions discussed by people these days: Who were the best mom and dad on a TV show? Who is the best talk-show host? And perhaps most importantly, what is the greatest TV show of all time? In consort with this weekend’s Emmy Awards broadcast, host Barbara Walters delivers the results of a recent People magazine poll to determine the most beloved programs and personalities in TV history. Expect a steady succession of clips from classic sitcoms like Seinfeld, All in the Family, The Cosby Show and dramas like L.A. Law, Hill Street Blues and Dallas (the old one, not the new one). It’s all from the American perspective, of course, so don’t expect to see The Beachcombers on the list.