The original Man Who Saw Tomorrow is probably closer to shlockumentary than documentary.
1994 — "Critic's Corner", The Washington Times, 5 July 1994:
It's another shlockumentary from NBC, the network that brought you "Ancient Prophecies" and "Angels: The Mysterious Messengers."
1996 — Jay Carr, "More reason to knock on Wood", Boston Globe, 25 October 1996:
Think of "The Haunted World of Edward D. Wood, Jr." as "Plan 10 from Outer Space." It's the year's most irresistible shlockumentary.
2000 — "Dreadful season all round for Fox", Toronto Star, 19 May 2000:
Fox is devoting tonight to its shlockumentaries until midseason when it launches The Lone Gunmen at 8 followed by a project by Michael Crichton, the guy behind ER, Twister and Jurassic Park.
"Even though this show falls under the category of what some have called 'shlockumentary,' we've all got to say by putting those pictures up, the show has performed a public service."
[…] as has former Vice President Al Gore, whose shlockumentary about manmade global warming, "An Inconvenient Truth" fails to include a few inconvenient facts, […]
Nothing that followed the O.J. verdict—from the proliferation of cable news "shlockumentaries" to heightened racial tensions to the celebrity-stalking substitution of infotainment for actual journalism—was remotely uplifting, beneficial or enlightening.