It's "the first". Historical movie nerdity started right there.
SINCE then, movie-makers have taken the ideas _from_ Metropolis
and made it better and better and better, but if it wasn't for
Metropolis? You'd have no Teleporters. You'd have no AI.
Probably no robotics. No Isaac Asimov with the 3 rules of
robotics. Wouldn't have had thousands of people working on
robots, AI research; today.
It inspired all of the movies that inspired all of the
scientists / technology people to work on all of the things they
worked on.
Except NASA. They were inspired by HG Wells. They even based on
of their rockets DIRECTLY on that book he wrote. He's the reason
why Cape Canaveral is where it is. From Fiction to imitation.
So, it's historically significant. If they made it today? It's
never fly.
PS: Metropolis + The Matrix? Same movie without the love.