So, I watched TMP last Saturday (restored, Director's Cut, of course) and here's my controversial opinion.
It's good.
I enjoyed it immensely. It's gorgeous and it didn't feel long or padded. I'd forgotten this was where we first heard what would become the TNG theme! They probably could've cut some of the Magical Mystery Tour through V'Ger, but I think they were 1) trying to show the sheer
scale and 2) enjoying having a budget.
I'm at work so I don't have the novelization in front of me: does it have why Spock goes for Kohlinor? Yes, it's because he wants to purge those pesky (human) emotions, but was it losing Kirk and The Gang that drove him there? I think so. Trying to stop pain and grief. A very human thing to do!
I'd also forgotten about Spock laughing. What an awesome scene! Laughing at his own absurdity. The realization that Pure Cold Logic is
not what he wants. It made me think about the older & wiser Spock who will eventually tell Valeris that logic is the beginning of wisdom, not the end, and appreciate Spock's journey all over again.