I can appreciate that this was a really early roll of the dice that just got scrambled in release order, but that doesn't really excuse how much it isn't very good at all. It's my own fault, though.
So this episode dwells far too much on the two characters we're probably never going to see again. That's a flaw. Obviously the red uniforms haven't come in yet, so no help to me on the solutions count there. The episode claims that Mr. Spock is part human, and I don't know if that's going to stick. I see that they managed to keep the interest in Ridiculous Space Chess going, though. Also, for the record, the whole purple border of the galaxy thing is really quite stupid.
No McCoy and no Uhura means no good. The fellow who's substituting for McCoy has neither character nor charisma and I'm pretty sure we're never seeing him or the other useless "department heads" again. Except Sulu, who got a promotion to Not Background Character. Good on him, I say. Also Janice wasn't here, even though they had another blonde basically standing in her spot.
I should really learn to be less specific; I did say super-powerful aliens, so I kind of brought that on myself, but really they did two of the same sort of thing in one season and didn't think it would be a problem? Someone's got to get their head examined. I'll give them the silver eye effect, that was pretty cool. In the end, though, it seemed like an episode devoted to forcing the Captain into an artificially hard choice and then getting part of his shirt ripped off to show that science fiction can appeal to the ladies as well. Seriously, he wrestled a psionic god. He's nuts.