The Black Hole scared me. A lot. After watching it as an adult, I think the reason is the super creepy music. It's pretty freaky. I hadn't seen Psycho yet, so it wasn't the fault Anthony Perkins.
The Black Hole has one of the most boring opening sequences ever. Minute after minute of nothing but space images followed by several minutes of opening credits with primitive computer graphics. Then we get lots of radio chatter. It isn't until 5 minutes in that we see our first actor on screen. With a really cheesy robot.
But I have to say, once the movie gets going, it is either action-packed or full fledged creepy. Mostly creepy. Even though it came out two years *after* the first Star Wars film, the effects are often not up to snuff. There's some that work fine, others that are as bad as anything done in the 1950s.
As sanitized as Disney is these days, it's hard to imagine they used to put out movies with a bit of an edge. This is one of them. There is peril! And the occasional bad word!