I’ve been on a sort of Trek binge, going through every TOS and TNG episode, and I have to say that while it has its moments, The Original Series can be a real slog to get through. I’ve lost count of how many episodes consist of an alien being/artificial intelligence that their sensors cannot comprehend who somehow tranforms itself into a beautiful human female (complete with midriff and soft focus close ups) that Kirk seduces and then obliterates by the end of the episode (and no one gives a shit that it’s the last of its species).
TNG, on the other hand, I feel, had a greater variety of storylines and really took the franchise to a new level. A shame those movies were crap.