The part 2 is weaker. Why the hearing suddenly resumes with only Kirk, Pike, Mendez and Spock? It doesn't help the trial setting at all. I think a shorter introduction could have allowed to have a better developed conclusion. On the other hand, it was a touchy and ambitious exercise, so it couldn't be perfect and it remains a really great contribution to the Star Trek's universe.
Not grumpy, just bored.
At least, it made him convincing as a Captain close to the burn out.