This was a catastrophically terrible episode! Perhaps not a Threshold level of actively trying to hurt the viewer, but it fell completely flat on every level, and I will probably forget it by next week.
One comment said it was like "...a poor man's The Beast Below", and that was hardly a high benchmark to start with. Yes, it had some amazing singing and atmospheric flair, but we never actually learned what any of it was about. There was very little attempt to explain the back-story of the aliens, so you couldn't really understand what was going on. The plot was incredibly weak and it's only a matter of time before someone pathetically tries to pass it off using the "art" excuse.
It was kind of like Star Trek 1: The Motionless Picture, except all tinted red instead of blue.