So, is there anything redeemable about Superman IV? Well, some of the ideas could work as the basis of much better story-lines. Superman (or, more likely, Hyperion or Invincible) decides to disarm the world by force? How would the USA react? Or Israel? Or North Korea? Each hero is the body of the "American Way", so could this be construed as Western Imperialism or a straight-up act of war? With nuclear weapons gone, would the 'hero' start on tanks, planes and/or guns? Could the planet Earth soon be under a totalitarian regime where knives and pointy sticks are whisked away by an omniscient ubermench? How could ordinary people fight back, and how would other heroes react? Iron Man would be pretty pissed when someone tried to take the suit out of his bones and Black Panther never reacts well to a border violation. Hell, there's a good RPG or narrative scenario right there, Black Panther has to take down the Man of Steel gone rogue.
Don't get me wrong, unless you're a few drinks in, don't bother with Superman IV. It's a dull mess that makes no sense and is best forgotten. The fights fail to be interesting and there are too many sub-plots that go nowhere. To be fair, there was no chance of this being good after Superman III, but it didn't need to be this bad either. Only bother with it if, like me, you're a completionist. Still, it was far more entertaining than Super Buddies.