'Superman III' is just rubbish, isn't it? I wasn't hating what I was watching or anything, but I was just sat there continuously thinking: this is just bad, huh. Much of the movie feels like the titular character is sidelined, then even when he is onscreen he's... depressed? Odd choice.
Christopher Reeve remains good, no issues there. Margot Kidder is involved but barely features, to be fair Annette O'Toole is solid in her bit. Richard Pryor, Robert Vaughn & Co. are OK in terms of what they give, but their characters are highly uninteresting. I just didn't care at all.
That opening sequence really gives you a peek into what you're going to be watching. Of course there are signs in the prior movies that the filmmakers wanted to stray into dumbed down comedy and it might've worked as a standalone picture, but as a Superman film? Not a chance.