Not to simplify things too much but I'd say with a lot of stuff if it was done basically right it still works. In terms of comedy, among the '30s and '40s screwballs there are some of the funniest movies ever made. The strengths of Keaton, Chaplin and Lloyd are still on full display. Sherlock Jr. is both a better comedy and a better action movie than 99% of movies that were made in both genres over the next century. You have a point about horror/effects but something that relies more on atmosphere like Vampyr or I Walked with a Zombie remains pretty spooky.
Yes the lack of sound and/or color and the stylized dialogue and acting can and unfortunately will be stumbling blocks but the right thing to do is try and adjust to it, not turn away (that's not directed at you, ofc, just me rambling again), and keep digging if you like the big classics. But of course I'm saying this as the kind of freak who would obsess over The Maltese Falcon at age 7 without even any explicit encouragement from his own mom.