Great action with some twists; however, some scenes seem borrowed from other movies (notably Star Wars or Independence Day). The touch points back to the original time line (with, for example, role reversals) are fun. I do feel the story line was really too close to a TNG episode [spoiler alert] where an admiral makes an alliance that is morally wrong and pays the ultimate price, but not before many innocent people are harmed. Of course such deals with the devil are a mainstay of literature over the centuries...
Overall, one of the better in the Star Trek arc. You could see the original "bones" in the performance by Karl Urban. Anton Yelchin and John Cho are good as Chekov and Sulu respectively. While Simon is OK as Scotty, I see no need for him to have a sidekick. Did Paramount need another "action figure" to license or was this just for comic relief?