Superman 3 may be one of the worst superhero films I've ever seen. That opening credit sequence just goes on and on and isn't even remotely funny. Clark's return to Smallville doesn't really pay off, and Lana isn't nearly as interesting a character as Lois was. Apparently the idiots who made this film had no idea what to do with Pryor, so they just told him "be funny" and barely gave him any direction on the set. Not only is Pryor annoying in this film, but he seems to have more screentime than Reeve does. The bad Superman stuff is admittedly pretty good, and drunk Superman was funny, but they really botched his character when he screwed the blonde "bimbo" villain and then told her "I'm not that man anymore" later when they meet again. That's...not how Superman is. Also, what the hell happened to the fake kryptonite that made him evil? Unless I missed something, nothing's ever mentioned about it again. He just has this battle with himself and that's it.
I haven't watched the Schumacher Batman films in years, but this seems to be right along their level of stupid humor.