It is classic, it's a suspense piece and super well-done, but it could never hold up to the kind of scrutiny that virtually every episode of TOS is put thru.
Humans going light years to another world and finding it inhabited by a giant race and then going to her shack and shooting her with their ray guys?
What kind of logic is that.
It's a viseral piece of fantasy TV that is ridiculous in retrospect.
'I Shot an Arrow'--astronauts take off from earth, crash land and ASSUME they're on another world--even though it has the same atmosphere, gravity and landscape as California? And they're in a rocket not a starship that would make them a least think another star system. They think they're on an asteroid--with the same gravity as Earth?
'Where is Everybody' astronaut goes bonkers after 136 hours in isolation? Really? Literally thousands of humans have been in solitary confinement for months and come out sane. An elite astronaut goes bonkers after 6 days? Man they made a poor choice--he sure had the wrong stuff. They even said he had access to entertainment tapes. Shoot, I could survive for a couple of weeks with my Blu-ray collection and no company.
They're great, thought-provoking dramas, but great sci-fi?
As opposed to, say, "Miri" or "Bread and Circuses"?
Don't get me wrong. I just rewatched all three seasons of TOS, and thoroughly enjoyed myself, but let's not pretend that it was on a whole different level of scientific plausibility. If one is so inclined, there are any number of popular Trek episodes that can be made to sound just as silly if you're so inclined.
A giant space amoeba? Abraham Lincoln versus Genghis Khan? A copper-based Vulcan cross-breeding with an iron-based human . . . ?