If I were to watch Dragon Ball Z now, I'd probably drop the series. I still remember it fondly, but it's too slow.
The first two seasons of the Pokémon anime aged well for me. Individual games, too. But the series as a whole felt from an "I know all 386!" to "...it's a Tentaquil".
Chrono Trigger went from "it's okay, it's fun" to "...I spent my whole life underrating it, didn't I?" So did Final Fantasy VI.
Same deal with Dostoyevsky. I guess you need some maturity to understand things.
Baudelaire, though? Hard pass.
I still love 1984 and Animal Farm, but I want to drown 90% of the muppets talking about them.
I can't stand Legião Urbana any more. Pink Floyd on the other hand aged well, so did Nenhum de Nós.
To be honest I was never too much into movies. There's one or another thing that I like (Modern Times, 8 1/2, The Shining), but it's mostly unchanged.
I think that's what Dragon Ball Z Kai was trying to solve, the ridiculous pacing.
Granted, the pacing sucked back then too. I remember it taking years to get to the event where Goku finally went super Saiyan. That whole Namek saga dragged on for far too long with nothing actually happening.
I remember for most of the Freeza saga Toonami would make a big deal about having a week of new DBZ episodes. They would play one new episode Monday to Thursday, then start back at the Raddits saga and buy the time they caught up to where they were they had 4 more episodes translated, and then they would do it all again.