The second area that I liked was the challenge that Sybok poses to Spock on a very fundamental level. It's an encounter between polar opposites. He flummoxes Spock completely. Sybok has this easy going, gregarious manner about him.. Things seem to come easy to him. Spock constantly struggles with his competing inheritance, finding things difficult. Spock for a time is a bit lost until he is vindicated in the end and finally comes to terms with his half brother as Sybok sacrifices himself for their escape on good terms
The whole soap trope of a "long lost half brother" I choose to see in a satirical light and as a dig at the extraordinary degree in which Vulcans repress unwanted or "embarrassing" features of their past. Despite their logic, Vulcans are often governed by their total disdain at emotion with results that often leave us incredulous. But that's the Vulcans for you. .
This has always been true to me since the first day I saw the movie (June 9, 1989). Vulcans, and Spock in particular, have traditionally been very tight-lipped about family and culture. Nobody knew Ambassador Sarek was Spock's father until Spock revealed it early in "Journey to Babel." Nobody knew that Ponn Far was the issue with Spock's behavior and requests for LOA in "Amok Time." And here, nobody knew that Sarek had a "disgraced outcast" of a son with another mother.
It fits perfectly with established lore about the character and the Vulcan culture.
This is one I honestly think people bitch about just to bitch...because otherwise it makes perfect sense.