I was channel surfing and stopped on Superman IV ... I forgot how bad the special effects were 25 years ago. Could see the wires in several scenes.

I think a lot of it had to do with the movie itself. It was pretty cheaply made. In comparison, I challenge you to find any wires in the first Superman from 1979. You won't.

Whoa there . . . hold up . . . wait a minute . . .
Don't even BEGIN to imply that Superman doesn't really fly . . .
Of COURSE Superman can fly . . .
And way better than those fake Karate/MatrixKungFu characters.

But not as good as this . . . =)
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