Yeah it's aged phenomenally well, and makes more modern Star Treks so frustratingly awful. The Visitor is arguably one of the best episodes of any Star Trek ever, Past Tense was basically prophetic. And so many of the episodes are extremely insightful on human nature - For the Uniform where good can so easily become evil - In the Pale Moonlight being of a similar nature, and so many more.

One of the things I'm most looking forward to is watching the series with my kids when they're old enough.

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Unrelated but the TNG episode Tapestry also deserves a mention. [1] Wtf happened to media. Writers used to actually understand people, now everything is so trite.

[1] - https://www.youtube.com/watch?v=mGvUDvZ7KyU

I watched it when it was originally on in the 90's. As the show got more serialized it was like a cliff hanger or huge event every few weeks. Then we got a great 10 episode arc to end the series.

"Death to the opposition!"

- Commander Worf, Take Me Out to the Holosuite (7x4)