Waterworld was a flop that got a reappraisal, and is now considered a pretty cool movie. It was really a victim of a critical wall that was against it from the start. That happens with some movies.

Babylon is another. That's going to get a reappraisal at some point, and become a cult classic.

Showgirls is going through a reappraisal, and people are starting to see it differently. It was a Paul Verhoeven movie, of course it was great.