The first 50 issues of Man of Steel is written by Walter/Louise Simonson....yeah they're pretty good Superman writers.
Superman, just like any long-running character, has many "unknown" or "underrated" stories.
One of my pet peeves is when people undermine Superman's intelligence, that's just a big dumb brute.
Which is one of my favorite stories is "The Most Dangerous Door in the World", where he outsmarts Lex Luthor and makes him look like a complete fool.
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Pre-Crisis Supes is just the best.