Having recently rewatched this, I was struck by something in Spock's narration. How can a supernova pose a threat to a galaxy? That's what Spock says, that a star will go supernova and 'threaten the galaxy' - huh? He then says that he promised to save Romulus, and then when en-route the supernova's wave destroyed Romulus.
This to me doesn't really work as a set up. Stars don't just go supernova overnight. The Romulans would have foreknowledge long before that destructive wave hit their planet and, logically, would have moved their population off world. I suppose you could argue that they didn't do so because they thought Spock would solve the problem, but it doesn't seem intelligent not to have some sort of back-up plan. Especially since Spock's timing is so off. What was his plan, to wait until after the star had gone supernova before creating the black hole - isn't that cutting it close? Also, where was this star? Because it's clearly not in the same system as Romulus, because without their own star the planet would be screwed anyway. So how many light years away was the star? Why didn't they evacuate the planet in between the star going supernova and the wave hitting their planet? Maybe the line 'then the unthinkable happened' is meant to hang a lantern on the improbability of the whole thing.
And the years haven't really changed how I feel about Nero and his murky motivation, or the tasteless destruction of Vulcan and billions of its inhabitants. I still find Nero's anger towards Spock to be entirely misplaced given what we are shown in the film. I chalk this up mainly to the fact that the writers were looking to recapture that Khan dynamic.
Also, I noticed that there are parts of the film where it seems like the characters have all read the script and know what's just happened. Kirk and Sulu give appropriate sad faces and seem to know Spock has lost his mother, seconds after it's happened and without even knowing who the blip on Chekov's monitor was.
Imagination will often carry us to worlds that never were. But without it we go nowhere. - Carl Sagan