Watching "Amok Time", and it was said that Spock is the best First Officer in Starfleet. This is after he's kidnapped his old CO, falsified orders, hijacked Enterprise and set course for the forbidden world Talos IV. And in this episode, he apparently killed his CO, after altering the ship's course from Altair to Vulcan against orders. This man is the best XO in Starfleet!? The standards must be low! What has the second best XO done, then? Committed genocide?
It's amazing what Starfleet officers can get away with and still stay in the service, even be considered exemplary officers. The admiralty must like nonconventional thinkers!
Yup, all that and still kept a clean service record.
I'd say that's pretty damn good.