Favorite thing about tos? It's uniqueness, especially the way it looked, there was no other show like it at the time and argueably, never one like it again. I would never say tos was the best Tv series ever made, but it was certainly unique, something greater as a whole than the component people who created the show.
It was a product of its time, where resources for putting together a science fiction film show that had to look futuristic were quite limited, compared to today. But sometimes these limitations can make people use their imaginations to come up with solutions and I think the people that put the show together were very imaginative.
Great cast, emphatically including the minor players, Nichols, Takei and Doohan. I consider Koenig and Barrett to be a little weaker but still pretty good.
The scriptwriters, they just came up with some good stories and good, sometimes great dialog.
Matt Jeffies' work on the show, most especially the tos Enterprise. One thing about tng's Enterprise D was that from certain angles, it didn't look all that interesting. I remember early in season one there was a shot of the E-D from an angle that just didn't make it look very interesting. Apparently, I wasn't the only one who thought this because I noticed they never, or very rarely sshowed the ship from that angle again for the rest of the show's run.
The tos Enterprise looks very good and interesting from any and all angles.
Theiss's costuming could be so interesting. And on and on with the resst of the people working on the show.
It could be hit or miss with some clunker episodes but even those can have good aspects to them and to me, still watchable.
All these people including the ones I didn't mention coming together to put out the episodes. And in a hurry to boot, managing to produce what I consider about the most unique show ever made.
Robert