@BillRM,
ome of the old "action genre"ovies held up a bit better because they take a topic that is still subject of conjecture. Stuff like "The Valley of the Kings" or the first and third of the Indiana Jones movies.
canadian movies about the exploration of the continent hold up really well. 70s versions like "The Black Robe" or"The Trap" with Oliver REed are still a good watch and fit on my "I can watch this over and over" list.
Teeny Bopper movies of all ages fare poorly as well. As did most of the Disney (pre-Pixar) comedies