I 100% agree that Urban got down McCoy perfectly.
Oh, and the idea of Kirk becoming captain of the Enterprise (Starfleet's flagship) when he's only a cadet is not believable.
Technically speaking he isn’t “only a cadet”, he’s done the Kobiashi test, according to Trek rules that’s basically the final exam from the officer section of Academy. So he’s about to be not a cadet and a commissioned officer, by old canon at that point he was on the fast track to being a captain, in this new canon he’d just saved the earth as an acting captain.
I think it is interesting that McCoy is the one of the big three that did not change.
And that The Enterprise crew saves the Galaxy about a dozen times is somehow believable? Do you believe that 007 is an expert at skiing, car racing, flying, piloting a space shuttle, scuba diving, speaks 15 languages and has never been shot?
It’s a movie!