I'm glad to see you re-evaluating your stance on older movies.
I feel like I'm discovering fewer and fewer "masterpieces". In the past year, I've only given four new viewings my highest rating: The Turin Horse and The Tree of Life which were both pretty much expected, Secrets & Lies which I already had a good feeling about, and the one true surprise, Thirst for Love. This could be any combination of these three factors:
1) I'm getting stingier with my "masterpiece" rating
2) I'm not looking in the right places
3) I've already seen everything I'm likely to love
I hope/believe it's mostly 1 and 2. I think I've actually gotten more generous lately, looking for the good in most films, but I do hold back from that highest rating for movies that truly blow me away.