This movie is about how the Klingons and the Federations finally have peace with each other.  Up until then, they always seemed to be at war with each other.  Kirk does not trust them due to the fact that they did kill his son.  If I remember right, it was in star trek III, that they had killed his son.

To me, I thought that it was a decent movie. I think that it could have been better. It could have been longer, but still it is decent to watch.

Worf from TNG is in there, but he is playing one of his relatives that happened to be named Worf.  TOS and TNG are two different set of years.