Since smirnoff's original question was about what "holds up", I'm curious to know approximately when people last watched their selections.
RKO 281 and Indictment: The McMartin Trial are Essentials and both have been watched twice in this decade. Ghostwatch I've seen three times in the last 10 years.
I will back up Midsomer Murders, which I discovered this decade, but the best BBC murder mysteries in the 90s come from
Poirot. There are two Poirot movies from 1992,
The ABC Murders and
Death in the Clouds, which are the gateway to getting people into watching the entire series starring David Suchet.
I kept debating
Into the Woods, which aired on American Playhouse in 1991. While it played on television, it's a filmed performance of the Broadway Musical and it was filmed in 1989.
There's a Series called
Century of Cinema that ran from 1995 - 1998 that contains the Essential mini-series
A Personal Journey with Martin Scorsese Through American Movies (1995). The series also contains
100 Years of Japanese Cinema by Nagisa Oshima,
A Personal History of British Cinema by Stephen Frears,
40,000 years of dreaming by George Miller and
2 x 50 Years of French Cinema with Michel Piccoli and Jean-Luc Godard. I have to mention the last one because of the description, "Godard asks why should cinema's birthday be celebrated when the history of film is a forgotten subject." Such contempt.
Buffy the Vampire Slayer is a great series, but unfortunately The Body and Once More With Feeling played during the next decade. That leaves
"Hush" (1999) as the great standalone episode. (Other great ones like "Doppelgangland", "Passion" and "Becoming" require a familiar knowledge of the series.)