The Black Hole (1979)
The Good: Great special effects and set design that, thanks to remastering, have stood the test of time pretty well. This was Disney's most ambitious and expensive project at the time, and it shows. The pacing isn't bad either, and the story is not as dated as I thought it'd be.
The Bad: Some pretty bland, wooden, acting. I guess most of the budget went to other departments, not enough left to motivate some of the actors to actually act. Random moments of humour don't really match the overall serious tone of the movie.