The ‘Way to Eden’ is considered by most critics and almost all STTOS fans as the prototypically worst of worst 3rd season Star Treks. It ranks along with Spock’s Brain as what happened to the series once the network stucknits nose into the production.
Godawful.
I sort of liked “Spock’s Brain” too.
I do agree that the 3rd season was weakest, especially the last few episodes with one exception which I can’t recall right now
It had clearly run it’s course by then.
Actually none of the episodes were really believable but some were worse than others. For the most part it was best to just ignore things which did not make sense and enjoy it.
One thing which really did bug me was Spock always being anti-racist while denigrating humans all the time. Yeah, I know he was half human.