I thought it was great! Gave it a 9. I was expecting a hour-episode version of The Undiscovered Country, but it was a great episode. Archer's talk with Kovos about Klingon society and the "classes" provides a lot of insight into their culture, and it had a few good lines in it too. I like when they're in Rura Penthe near the end:
"This is how you got in here in the first place... by being so foolish."
"You're... you're welcome."
The character of Advocate Kovos was very well-portrayed, and I love the attention to detail they paid to make the court look exactly like it did in ST VI.
Only bad part about it was the ending was kind of poorly thought-out... they didn't have enough time left in the episode to actually show Archer's escape from Rura Penthe.