Is it that bad? Well . . . depends. There are probably about 70 episodes I like better, but there are a handful or so that I like less. This one is not as over-the-top ridiculous as The Omega Glory, it's not as flat-out embarrassing as Plato's Stepchildren, and it's not as irritating as And The Children Shall Lead.
But in the end it's in the eyes of the beholder; and as someone mentioned (or alluded to) earlier, even bad TOS is pretty good. Which made me think of that tired old cliché about sex . . .