The main question is "Why aren't movies from the last 25 years rated better than films from years past?"
The thread title is about agreed-upon classics. It's more about what can be measured with some objectivity rather than just individual taste.
Gatekeepers seem to like Last Jedi (to be fair, so do I.)
That said, it's a complex comparison if we're comparing a new episode in an ongoing series versus the first episode in a different series. There isn't a contingent of Benoit Blanc fans claiming the character doesn't match previous appearances.