The original Star Trek was a bit dated by the time I was old enough to see it in syndication. I admit I've seen quite a few episodes, but only out of boredom.
But I LOVED Star Trek TNG. I'm pretty sure I've seen just about every episode at least once. It reminded me a lot of the "Fantastic Four" cartoon I watched as a kid. Several of the cast were like superheroes with their own special abilities: Deanna Troi was the psychic, Geordi had that super eyesight, Data the android could compute stuff really fast, and Worf was the warrior (the last one wasn't much of an "ability" but you get the idea). So, I assumed I'd love Deep Space Nine, and I did enjoy some of the episodes - the pilot was especially good - but it never grabbed me the way TNG did. And Voyager was a complete snooze.