I have problems with several plot points.

Rating: 5/10 (8 June 2011)

I have several glaring problems with the plot. I do demand that movies I watch at least try to make some sense, and not many people seem to have noticed these which I will point out.
1. Spock Ejects Kirk from the Enterprise. Does the starship not come with a brig? What does Spock think will happen to his career if he ejects a cadet onto a barely livable ice ball where he is bound to be eaten by one of several large predators?
2. Just so happens.. Out of an entire planetary body we would assume is at least the size of our moon, Kirk Just So Happens to land a couple of miles from where Spock is hiding in a cave and he Just So Happens to run in the random direction of that cave and then encounter Spock.
3. Who are the two very unlucky Romulans in the giant laser drill? What exactly is their job inside there? It looks to be a very precarious and highly dangerous job that must be totally necessary otherwise these two jokers would stay up on the big ship. Honestly I wouldn't want to be inside any kind of mechanism that's dropped 200 miles from orbit into a planet's atmosphere and then periodically spews flames because its getting so hot from the amount of energy it's discharging.
4. The entire mechanism of the giant laser drill and black hole bomb is totally unnecessary. Are you saying that if you created a black hole on the surface of the planet nothing would happen? Trust me, the black hole would eat everything up, maybe just a little slower, and you don't need some elaborate tunnel deep into the core of the planet to do it.
5. Do Vulcan and Earth not have an Air Force? So this giant laser drill is hanging there in the sky blasting the planet for apparently a couple hours or so. Are there NO atmospheric fighter jets anywhere around? A 400 year old F-15 and one missile could have saved the day. A shuttle with a welding laser. A surface to air missile. Randy Quaid drunk in his F-18 from Independence Day crashing into it.
Are you saying that this thing can hang over San Fran and nobody is going to send up a squad of fighters to blow it away and we have to wait helplessly for some starship outside the atmosphere to show up?
And then there was the spot that the drill was firing at on Earth which was into a bunch of water. The exact worst possible spot to try to use a laser drill oh never mind. None of it makes any sense.
6. Spock needs an Astronomy 101 class. So the back story of why old Spock needs a black hole bomb in the first place is that there is some supernova that is going to blow Romulus up and they need the black hole bomb to "absorb" it. Now I'm not an astrophysicist, but I did take plenty of astronomy classes as I'm sure many Trek fans have.
A supernova is a star blowing up. If it is a star outside the Romulus star system, then, even if the shock wave moves at the speed of light, and that star is right next door to Romulus, then you have at least 4 years before it arrives at Romulus (about the closest distance stars are to each other in this part o the galaxy.) More than likely, you'd have a hundred years heads up because shock waves from supernovas don't move at the speed of light. Since you have ships that can fly from Earth to Vulcan in about 10 minutes I'd say you should have plenty of time to do whatever you needed, and it wouldn't come down to the last second.
Or, if the star that is blowing up is Romulus' home star, then I don't care what you place in front of it to "absorb" the explosion, every planet in the system is done for. The supernova remnant that will be left afterward won't be anything like the star Romulus is used to and nothing on the planet will be capable of living in that radically altered environment. And, incidentally, Romulus would have been engulfed by the star hundreds of years earlier as it grew into a red giant prior to blowing up.
So basically the whole back story is completely impossible, even if we agree that there can be a thing called "red matter" that makes black holes and even if you could use this black hole to travel backwards through time. Since its Star Trek I can buy that, but what I can't buy is this very vague and ridiculously unscientific supernova that is going to blow up Romulus.
So maybe most of the movie-going audience doesn't know a galaxy from a star system or a nova from a nebula, sure I guess I can forgive that. But most of the movie-going audience should know that Vulcan and Earth aren't going to sit there helpless without an air force because apparently in the star trek universe the only things that can fly around and do anything useful are star ships. Are you reading this JJ? Next time at least get the plot to make some sense even if you must totally defy all scientific knowledge about space.