Watched this last night with some of my friends who are huge Cumberbatch fanboys. Solid first half but second half rapidly begins to lose steam until movie (and villain) goes out with a whimper. For some reason, I couldn't connect to the emotional scenes like "the death scene", probably because of the weak script.
Khan was not used properly, which is the biggest flaw of the film, considering they chose to make Cumberbatch the focal point of the marketing over the Enterprise crew. Anyone who thinks he is a more memorable villain than the Mandarin is just deluding themselves, sorry. Also, didn't care for the twist with the Admiral.
The Enterprise crew were fun as expected, especially Pegg and Pine. Effects were good but at points some alien make-up looked corny like the primitive albino race shown at the beginning. Alice Eve is hot. That's it.