I got halfway through it and was really bored. Though I'm sure I'll finish it at some point. Beautiful to look at, it made too many unnecessary side trips (Peter Kirk, Karg?).
Plus Kirk seems awfully combative right off the bat, for no real reason.
Kargh is apparently their "go-to" Klingon, and that's not a bad thing. William Campbell was supposed to pay a recurring character in Classic Trek.
And yeah, Kirk is combative -- but then, he's going deep into Klingon territory and finds out he'll be betrayed by the Kitumba as well.