I also agree with Equus that the worst movies are actually those with high minded intentions which just fall flat as a pancake. Like "what were they thinking?" Those that were made with no intention but a quick buck effort short on production values are too easy to make pot shots at. Ed Wood's effort are hard to categorize as the did believe he was making great pictures but obviously didn't have the money to complete anything better than the schlock that appears on the screen. Some films that critics believe are not-so-good are those guilty pleasures we are often embarassed to admit that we like (and then sometimes not!
).
One of those was "Summer Lovers," a rather silly confection but it's so much like a dream vacation nobody ever had that I enjoy the film.
"Jefferson in Paris" was a high-minded, way too pretentious Merchant/Ivory film that should have stayed in the far recesses of their minds to make. Nick Nolte as Thomas Jefferson? They could have hired Keanu Reeves or Jim Carrey and done just as well.