I'm a long time Trek fan who hasn't actually seen all of any of the series, just lots of bits here and there. But now, I'm watching TOS. Only 2 episodes in, so far, but am surprised at how surprised I am at the symptoms of the sixties. Crewmen leering at Rand, overly creepy Twilight-Zone-esque Charlie, etc.
It is good though, don't get me wrong.