Sarek must be the worst dad ever. Ok, that is an exaggeration, but he is really not so great. Sometimes I wonder if he developed later after marrying Amanda humanphobia or just emotionphobia? For a guy who married a human woman he really has a lot of problems with emotions in others.
First there was Sybok who got banished for liking emotions too much and I suspect Sarek was for the banishment, too. Then there is Spock who is actually half human, but was pressured by his father to act like that wasn't the case. So first he impregnates a human woman, but then doesn't want the child to be part human. Where is the logic in that? It is also really crap father and husband behaviour to practically tell your son that his mother is a lesser being whose nature is worth less than that of Vulcans. And now there is also Michael. A fully human girl he is raising for some weird reason as a Vulcan. Why? I mean even if he feels too incapable and inexperienced to raise a human girl in a human way, there is still his wife. Why is he not just letting Amanda take the lead in Michael's upbringing? Then he could just follow his wife's example or just add his Vulcan perspective. There is really no good reason to raise Michael completely as a Vulcan, especially as she isn't a baby anymore when he takes her in. She for sure was used to act like a human as a little kid.
And by the way does Michael not have any relatives left? No grandparents? No uncles and aunts? No family friends? Really no one? Is there no one who would take her in out of love instead of a feeling of responsibility?
I'm curious about Michael's character, and eager to learn more.
As for Sarek, yeah, I can certainly see how he may not be up for any "Father of the year" awards anytime soon. However, I've always had trouble with the Sybok story given that he was retconned into the canon for purposes of Star Trek V. I think looking at Sarek's relationship with Spock is a better barometer of Sarek as a parent. Like many parents I have known - Sarek had trouble expressing affection towards his son. However, in his defense, when he learned of Spock's passing, Sarek immediately journeyed to Earth to speak to Kirk in Star Trek 3. The novelization describes Sarek upon Kirk's first seeing him as if he likely had not slept since receiving the news of Spock's death. Sarek does a lot then to help his son, he seeks out Kirk, and then urges the fal tor pan ritual. Upon questioning, Sarek admits that where his logic fails him where his son is concerned. So yes, Sarek is not a touchy-feely father, but he clearly cared deeply for Spock.