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!
Well let's not forget, they did recruit and appoint Ron Tracy as Captain of the Exeter; a man given to distraction for power and profit, apparently.
One has to wonder what kind of standards SF went by for their recruitment practices.