I didn't hate El Cid, if you want to call that a classic, but the film-making was . . . amusingly unsubtle.
Just thought of this one...not sure if it's old enough to be a classic yet, but's still pretty popular--Robin Hood:Men in Tights. Mel Brooks really phoned that one in. When I was a kid and hadn't seen his older films I liked it well enough. Then I saw it as an adult. I had to watch it again to make sure it wasn't just being at sea that affected my brain, because I didn't laugh once. Even the song "Men in Tights" is lifted right from the end of "History of the World, Part I," almost note-for-note.
That movie is alright, definitely not my favorite Mel Brooks film, and definitely underwhelming in comparison to some of his others.
worse is if you're of the age to have seen wartime cartoons on Saturday morning... then you know the tune from elsewhere [YT="skip to about :05"]gDloR74TWEw[/YT]
I haven't seen it in awhile, but I remember the direction and camera work on the Yul Brenner version of "The King and I" as distinctly underwhelming: Scene opens. Medium-wide shot with a static camera. Scene ends. Next scene: Medium wide shot with a static camera...