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Well I'm someone who was brought up on TOS reruns. So that was my Star Trek. My Star Trek was about "going boldly" into the unknown. Only TOS and Enterprise have that aspect. TNG was "going boldly on cargo missions" and "having meetings about critical situations" in the season I watched. I actually found myself bored by it. (Over many years I've seen, likely, most of the episodes here and there because of the circles I socialize in—and still haven't seen anything to change my mind.) DS9 was "boldy staying in place" which is almost the anti-Trek for me. And Voyager was "boldly fleeing home". None of that is the vibe I loved in TOS. Only in Enterprise did they go back to what it was that grabbed me with Star Trek in the first place.

(I haven't seen any of the subsequent series at all: DIscovery, Below Decks, Picard, whatever. What I've heard about them from their fans suggests that I'll have them in the not-Trek pile as well, though.)