This is probably true of Citizen Kane. However, this isn't true of all the arty farty, black and white, older, or foreign stuff.
Some of those aren't just 'good for their time', highly rated because they were/are innovative/interesting, or because people want to be pretentious. They're still fucking good.
Eg. I watched Tokyo Story (1953) when I was in my early twenties. Tops critics lists. Seems like it's just another pretentious movie. Black and white, boring, pondorous, gave up on it. Watched it a few years later when I had a bit more life experience. Hit me like a truck. Openly wept in the movie theatre.
Sometimes if you push through, you will be rewarded.