Films that hold up well, IMO:
Conan the Barbarian: excellent score and production values for the time, great costuming, and Arnold being perhaps the perfect actor for the lead role. Not to mention James Earl Jones as Thulsa Doom.
Jurassic Park: despite some flubs, the score, the sets, the pacing, the acting, and yes, the dinosaurs are still holding up for me. That “holy shit!” moment when the T.rex first comes into full view still looks a LOT better than nearly every CG dinosaur scene that’s come after. (and yeah, when I saw it in theaters opening day, and the T.rex burst through the fence, there was dead silence in the theater for an instant, then some guy about three rows ahead of me actually muttered, “holy shit!”)
The List could go on, but the OP was really asking about what films don’t stand up today, right? So here’s my list:
Nearly every Friday the 13th movie. They so quickly became parodies of themselves it’s sad.
Dreamscape. The plot is paper-thin, the villain is a caricature, and the claymation snake monster is laughably bad.
The Dark Crystal. Love the puppets and all, but the story bores me to death now.
Among TV shows, the ones I used to love but can’t enjoy now include:
Hart to Hart
Facts of Life
Pretty much anything with Tony Danza or Scott Baio, and somehow I merged my disdain for them in my mind.
The Cosby Show seemed brilliant at the time, but I just don’t find it very funny most times I’ve seen reruns these days.