Reading the comments and ratings, this movie does not seem to be watched by the right people. I think the problem seems to be in the expectations and the movie being something different than what we are used to these days when you read the plot of the movie.
If you expect a normal sci-fi, where the sci-fi part is important for the story, it's not, it's just the setting. The cheap 70's sci-fi look is humor for me.
If you expect a comedy, with clear, loud jokes, or people being funny, it's not. I found the humor more in the irony and in the annoyingness and painfulness of the characters.
If you expect a spectacular blockbuster, it's not, it's almost more an art-house movie.
If you expect a serious drama, it's not, although it is about loneliness and emptiness in people.
So yes, I actually did enjoy it, because it was different and well made.