Yeah, it wasn't that the filmmakers were from TV vs features, it was just talent for bringing character driven story to the big screen. TWOK was about more than Khan, it was about Kirk getting older and losing Spock ultimately. This started the trilogy of films that were at their core the story of this family. Sure they had the guest bad guy in Kruge in III but it was the Search for Spock and then Spock finds himself in IV.
IMHO they should have made the TNG films about the characters, how they evolve and change, live and die. Not just put the characters in episodic films where one has little bearing on the next.