"Star Trek", the original series, was ... but the standards of the day ... cutting edge television.
It was innovative, controversial, and provocative.
Yes, it was over dramatized (we're looking at you, Shatner). Many of the scripts were simplistic and overly preachy. Yes, the fight choreography was hilarious and, yes, even the music was terrible.
Only about 1/3 of the original series episodes can we watched today without being considered satire.
But ... viewed against everything else on TV in 1966 ... it was a phenomenon and REALLY GOOD TV.
However, what is most important about "Star Trek" wasn't the dated episodes, but the inspiration it brought to millions of fans that, just perhaps, the future could be a little better, a little more civilized, and a little more exciting than it is today.
It was the last Science Fiction franchise with a vision of an optimistic future, before we decided that all science fiction had to be dystopic.