Jaws bored me personally.
I tried to educate myself on the classics a long time ago. Citizen Kane was supposed to be the greatest movie ever but when I tried to watch it, it was so boring that I couldn't finish it. For me - and it seems most people- films from the 80s onward click while 70s is more mixed, and 60s and earlier are way too old. People communicate differently, the filmaking is slow, and acting not so good & many references are out-of date and not understandable by someone 50 years later.
Of the 70s movies: Godfather I & II, Apocalypse Now, A Clockwork Orange, Rocky, still hold up though. Godfather I & Apocalypse are two of my favorites.
AFI’S 100 YEARS…100 MOVIES — 10TH ANNIVERSARY EDITION | American Film Institute
I tried the same with the biggest comedians- I found myself liking comedy from the 90s onward but 80s comedy was way too old.