I thought it was really dumb. Like, I enjoyed it for the first 50% or so, but once we got to act three, it went from being a spirited Star Trek-themed action movie to a tedious Star Trek-mocking action movie. Ending with a chase and a fist fight was very underwhelming too.
[sblock]The Kirk-Spock sacrifice switcheroo mildly pissed me off. You don't get to have a heroic sacrifice of your character if I don't really like the character. Kirk is still all swagger, still has never really lost anything in his adult life. In The Wrath of Khan, Spock dying helped Kirk grow as a character, and it was a powerful scene because you could see that the two characters had a long, deep friendship. In this movie (The Ret of Con), Spock doesn't need to learn any lessons. Kirk mock-dying has very little impact, and it does a disservice to the original.
Plus the KHAAAN yell was just schlock.[/sblock]
Cumberbatch did great with what they gave him, but c'mon, it's Star Trek. The triumph over the villain needs to be a moral and ideological one, not a physical one. And after watching the recent J.J. Abrams interview on the Daily Show, I'm not surprised that the movie really missed the point on what Star Trek is supposed to be about.