Bathroom Monologue: Superman has no weaknesses except…

…Kryptonite.
…magic.

…red suns, and apparently any freaking red lamp put together by a two-bit prodigy.
…the umpteen other Last Kryptonians Alive.

…the hundreds of other characters, non-Kryptonian and still depicted as equal or greater in strength.

…mind control.

…nanobots and other pesky SciFi infections.

…blackmail.

…declining ad rates. He is a newsman, after all.

…really, really sharp things, of which the DC Universe has a questionable abundance.

…the villain-of-the-week who beats him up to seem formidable when facing other heroes.

…constantly being outsmarted despite spending all his time thinking about crisis management.
…bad writing.