Me too, I grew up with Star trek too in the 60s and maybe that’s the reason I like that one the best, but like my brother said, what made it so great was how it made the viewer use his imagination. Forget the cheesy sets and all the other stuff (like aliens always speaking English)...It was done in an expressionist -avant-garde style (no doubt due to budget constraints) which was a good thing because it forced imagination which made you feel it was yours. I remember my mood going wooooo absolutely through the freakin’ roof when I heard that theme...”Space...the final frontier..” Holy cow, nothing will ever beat that. I’m 52 and I think I must have literally watched every episode at least a few 100 times, I never get tired of it, it’s impossible.
I have a special connection to the original Star Trek. I saw every episode several times, and saw them all again after my daughter was born (Georgetown, Walsh School of Foreign Service, '94) When she was around 8, she saw her favorite episode, Devil in the Dark, when I realized that the series had universal appeal for all ages that were blessed with intelligence, imagination, a sense of humor and intrinsic humanity.
Hard combination to beat.