Buckaroo Banzai certainly isn’t so bad it’s good it’s just something that should be fun and is quirky and full of ideas but just doesn’t work for reasons which aren’t really easy to define.
It’s almost like the product of an alien culture where the points of reference are unknown so nothing it attempts to do really clicks.
If you sat down and tried to describe it to someone the film in their head particularly with that cast would be much better than the actual film.