Kelefa Sanneh plumbs the history:
One of the biggest differences between today’s reality television and its 1973 antecedent is the genre’s status. Having outgrown PBS, it has inherited the rotten reputation that once attached to the medium itself. In an era of televised precocity—ambitious HBO dramas, cunningly self-aware sitcoms—reality shows still provide a fat target for anyone seeking symptoms or causes of American idiocy; the popularity of unscripted programming has had the unexpected effect of ennobling its scripted counterpart. The same people who brag about having seen every episode of “Friday Night Lights” will brag, too, that they have never laid eyes on “The Real Housewives of Atlanta.” Reality television is the television of television.
(Video: Trailer for "Cinema Verite," HBO's take on the filming of "An American Family")
The Dish 