While The Final Frontier may be fairly ghastly, there are one or two genuinely good bits, including this moment near the end where Spockrescues Kirk from fake God:
Kirk: I thought I was going to die.
Spock: Not possible. You were never alone.
It's all in Leonard Nimoy's "Oh, please, as if you could ever think otherwise?" delivery.
Was it? He WAS alone. Spock off on Romulus, McCoy who knows where (if he hadn't died by that point), and neither even knew Kirk was still alive in any event.
Kirk: I lost a brother once. I was lucky enough to get him back.
McCoy: I thought men like us didn't have families.
Kirk: I was wrong.
General Korrd deserves a mention.
Personally I liked watching the growing bond between Talbot and Caithlin Dar. You only see them in the background most of the time but, they are awfully cute together.
Of course the mutual bonding between three seemingly incompatible groups like the Federation, Klingons and Romulans is something Gene Roddenberry always said was unavoidable.