Cliff and I own the DVD's of both the first and second season of All In The Family. We love that show! I've figured out the reason, too: we can see our own faults and foibles in Archie, Meathead, Gloria and Edith; so we can relate to everything that happens on the show.
There's a lot of Archie in Cliff.... and I guess a lot of Meathead and Edith in me. Every time we watch an episode, it leads to a discussion which probably makes us better people. Maybe that's why "All In The Family" was such a hit.