The farther we get from Roddenberry's death, the less "like Star Trek" the Trek universe material gets.
The fundamental conceit that made TOS work was "What if the better angels of human nature was in the ascendant?" This question is timeless.
Undiscovered Country was too obviously trying to make a political analogy and stumbling badly in the process.
Final Frontier (IIRC) was written in reverse: the conclusion that this being is a fake God, then push the cast around to get from a boring patrol mission to arrive at the end on time.
In contrast, Wrath of Khan was the best Star Trek movie.
Its immediate sequels begin well - Sarek trying to balance a lifetime of unemotional logic with a father's pain upon realizing his son is truly dead. In less than a minute of screen time he becomes a sympathetic character (in the TV episode he was an obstacle to be overcome) - but the films have an increasing 'hokey factor' as the thunderbolt of inspiration runs out.
I liked The Motion Picture as a 'thinker's Star Trek'. What if Spock wasn't constrained by a 30-minute TV time slot?