Me, too, original Trekkie here. I watched it first run. When I think about how long ago that actually was...!
Well, it's because of it's age, and the very low tech special effects, probably. But the stories were ground breaking, and the actors really believed in their roles.
I have watched other Sci-Fi's from the basic same time period, or even a bit later, ad they all have what many people describe as that 'campy feel.' Oh, well, I still like Star Trek. :-)
Stay cool!
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