I'm not a big fan of Star Trek's 3rd season. Even when I saw the original broadcasts (I was barely a teenager) I sensed the degradation of the show. I was completely unaware of the 'back story' - the 'Save Trek' campaign. There were a rew exceptions.
The Way to Eden - One of the most 'dated' of episodes, it should have been down without the obvious bow to the 'sixties hippy movement'. Spock was definitely 'out of character'in this episode. Walter Koenig got a decent piece of on air time for Chekov, one of the few pluses in the episode.
Requiem for Methuselah - Another episode that had a lot of promise, the writers fell back on a 'mountain of cliche's' in this story. Extending the story by staging accident's while allowing Kirk to romance an android?
Side Note: The Star Trek Universe has a big flaw when it comes to androids. In ST:Next Generation they make it look like Data was the first sentient android? What? Come on fans, would could forget Rayna?
This only the 2nd time a Kirk romance had any substance. But Spock should have used his "Forget" mind meld with Kirk in "The Paradise Syndrome", Shatner's best performance of the series.