Now admittedly, I did originally watch it because of Benedict Cumberbatch, as I am a big fan of him, and have been since Sherlock series 1. And because of Chris Pine and Zachary Quinto (fan of them both since Just My Luck and Heroes - and because they're hot... don't think I'm weird/perverted, I generally can not help but think they're all fit) but after watching the film, I found that there was so much more to it than hot actors.
I would go into detail about the entire film, but I feel like that would be boring, and would spoil the film for others, but i will say this. As someone who hasn't seen any Star Trek previously, not even the previous film, I thoroughly enjoyed it. I knew the basics of the story line of the Enterprise, e.g., Kirk being the Captain, Spock his first mate, identified by his pointed ears and blue jumper. All other characters I easily picked up on along the way too, which was a relief as I would have been very confused otherwise. The film itself was very good, with an easy to follow story line, with lots of action scenes, some funny moments to lighten the mood of the film, and some incredible CGI as well.
The make up was very good on the aliens involved, and the sets were very realistic. The actors themselves were very, very good too, I can always trust to have a good performance from Benedict, but what really blew me away from was how different he is from Sherlock. He looked almost like a completely different person from the skinny detective, in this, he was muscular, excellent in combat. Though he was still very intelligent, and did a very good job at playing a bad guy, something I haven't seen him do previously. All with a very sexy voice that just drew me in and made me hang on his every word.
Chris Pine was also a very good Kirk, he was slightly cheeky, but commanded respect and was thoroughly believable as the captain of a ship. He took the role in his stride, and portrayed his love for his team and his ship very well, and had me routing for him, despite me slight biased for Benedict's Khaan. The same can be said for Zachary Quinto, his portrayal of Spock had me captivated too. He played the idea of a Vulcan with emotions perfectly, though i was reminded of Castiel from Supernatural, though it wasn't necessarily a bad thing, as both characters are not used to feeling emotions and such.
In summary though, Star Trek Into Darkness is a very, very good film, so go out and see it as soon as possible!