I agree with his assessment, here 100%. That being said, I don't think that from the time that he makes that statement to any point later in the film that Kirk actually becomes the person who should take Spock's place there as captain.
Then theres examples as the movie progresses where he listens to his crew and accepts their conclusion, such as his decision to take Harrison alive rather than murder him with a torpedoe.
There is so much on again off again with Kirk listening to, and then not listening to the advice of people around him. The issue is that when it comes to... any sort of important decision, everything that Kirk does in the film is only making up for a FRACTION of what he's personally responsible for fucking up in the first place. The other part that bothers me is it's still ALWAYS Kirk getting by on dumb luck and his friends compensation for his lack of solid judgement. That's NOT the sort of person I'd ever follow under command of a starship.
Or when he chose to allow Carol to talk to the Admiral rather than continue to fight/run.
Which he did after exhausting his other options - delaying, and then making a run for it, so he's basically being forced into it. Again, it's is still a part of the trend where Kirk isn't so much someone with good judgement, as someone who's just got people compensating for his bravado and lack of planning, and just gets lucky in all the right ways (i.e. having Scotty aboard the enemy ship because Khan gave him a coordinate that he happened to give to someone who he fired from his post for attempting to avert the EXACT scenario that he's now stuck in).
Or how about the time when he accepted full responsibility for his actions while talking to Admiral Marcus in order to save his crew?
I hardly see that plea as being anything more than Kirk finally put into a situation where he's out of options, and ALL of his friends were going to die, so he was willing to take the bigger personal risk to save them - one that also left his ego intact in front of everyone.
In other words, Kirk develops as a character in this movie quite nicely.
Maybe he gets over his own fratboy ego a tiny bit, but he's still nowhere NEAR the level of someone who I could actually see anyone entrusting with the command of the flagship of the entire Federation. It seems like he's just constantly failing upwards the entire film, but at the end of the day his stupid luck, lack of planning and friends making up for it is what pulls him out of it, and THAT is what allows him to succeed. That's the exact same thing that's been getting him by the entire film. Kirk's blind bravado and incompetence doesn't improve AT ALL, he only learns to give over people a chance to step in, because he doesn't know what in the flying fuck he's doing 90% of the time, which is why he ought to be back at Starfleet academy, like he almost was.
Then there're things that he's "punished with" that never actually happen, like when he loses command of the Enterprise, gets sent back to Starfleet academy, becomes the Commander of the Enterprise under Pike, and suddenly becomes the Captain again when Pike dies and NEVER ACTUALLY EXPERIENCES NOT BEING THE CAPTAIN. Dumb luck means that he literally avoided EVERY SINGLE reprimand and punishment for violating the PRIME DIRECTIVE, (not to mention a laundry list of other protocols), but then after dying and being brought back to undo a warp core malfunction - that he caused by blatantly ignoring the warnings of his GENIUS head of engineering, he is then entrusted to be the head of a cutting edge 5 year science mission to explore other worlds?
BULLSHIT.
Not sure why you think the plot could be shitty either. I thought it was quite a bit better and made a lot more sense than the last movie, and felt more like Star Trek.
TBQH, I honestly remember next to nothing about the specifics of the first film.
The set pieces and action were grand, and most of the acting was great, but it's like there are a lot of great individual pieces, and they just don't tie together well. The whole specifics of the plan between Khan & Marcus and each party playing the other relies on this weird series of Kirk fucking things up in ways that no one wanted/planned for, but apparently everyone actually relied on.
Seriously.
• If Khan went to Kronos as an idea that it would be a safe haven, that makes no sense because Admiral Marcus wanted to start a war and would have gone there anyway.
• If he did it because he thought that Admiral Marcus would equip a starship with the long-range photon torpedoes (that contained the people he was attempting to free), he would have known that they would have bombarded the (seemingly) abandoned area of the planet with them from just outside the Neutral Zone.
• If he was planning on a boarding party, then the ship that was sent after him would never would have had access to the torpedos, and he'd have had a better chance just letting himself get arrested outside Starfleet.
• This ALSO all plays out to them even being able to discover where he'd teleported himself to in the first place (which Scotty did, because he developed the technology).
There isn't ANY CLEAR LOGICAL SCENARIO that I've been able to work out that would cause him running off to Kronos to ACTUALLY advance his plan that doesn't rely on Kirk suddenly coming up with some spur of the moment idea (that literally NO ONE IS COUNTING ON) to hail Khan and tell him that they have the torpedos, and then send down a boarding party that he can use to join them back on the Enterprise after he knows that they have them.
The biggest issue is that this interaction taking place here in that specific way is
literally the linchpin of EVERY OTHER PARTY IN THE FILM MEETING UP IN THE WAY THAT HE DESCRIBES from then on. He expertly details every single thing that is happening with Marcus and Kirk in exquisite detail, so he IS a tactician and a damn well detailed one. That's exceptionally bothersome that the KEY MOMENT in his scenario in achieving his objective makes NO DAMN SENSE. (Not to mention - how the hell does Admiral Marcus manage to mysteriously leave Starfleet and board a GIGANTIC secret ship on Jupiter during such an ENORMOUS CRISIS & where the hell is anyone else in Starfleet when they're fighting in near Earth orbit?)
I DID like parts of it. I'd watch Uhura confronting Klingons or Sulu commanding the Enterprise non-stop. I'd watch Simon Pegg play Scotty for 5 hours straight with no breaks. Hell, I'd even watch Benedict Cumberbatch beat up Klingons and other aliens and be a genetically engineered badass just because. I just don't buy anything about Kirk being who he is in Starfleet for a second, and those other key moments that tie everything together don't make a damn bit of sense to have been orchestrated by the masterminds who set them in motion.