I find this movie amazing, because although it's clearly a joke, it captures what it must be like to be totally different from the people around you. What Otherness is.
In our current time, when so much of truth is either taboo or in contention between our divided societies, those who want -- well, not Truth in some metaphysical sense -- realism, pragmatism or truth must feel a lot like the inhabitants of this space ship.
We're aliens among our own tribe.
This movie captures that sick feeling for me, and makes me smile at it. As a result, I have to say it's a great work of art.