I found it to be quite heavy handed.
Heavy handed? I always thought it was kind of mild compared to let's say, Attack of The Clones.
Heavy handed, as in clumsy and unskillful.
The story certainly lacks subtlety, the Starfleet officers lacked legitimate reasons to oppose the de-escalations of hostilities with the Klingons. The plan involve officers in the highest positions of power in the Starfleet Admirality, and also a Vulcan prodigy who obviously held Spock's respect, their reasoning should have been well considered, realistic and based upon knowledge and logic.
They were given instead the motivations of irrational fear and racial bigotry.
The Federation President to depicted as silly, self-absorbed and easily malnipulated by the Klingons. A stereotype cartoon politician. Given the year of release and subject matter perhaps it would have been more intriguing to have had a verison of Ronald Reagan who would have push the Klingons hard for the best deal possible, rather than a Neville Chamberlain who falls all over himself to give the Klingons everything they ask for in return for "peace."
A bit more tough talk on the President's part during his communication with Azetbur, where they agreed on a second attempt at a peace conference, would have depicted the Federation and the Empire as being on more equal footing. Instead of the Federation bending over backwards, which is what was put on screen.
That is what I meant by "heavy handed."