Shall we begin?
It was indeed Star Trek Into Darkness! They couldn't even tell us at the ticket collection point, so it wasn't until the Bad Robot logo came up that I managed a small, pleased squee :)
I have a great deal to say about it, but there's very little I can say specifically without spoilerage, so I'm going to ramble about my history with Trek instead. There is a point of sorts, but it'll take a while to get to.
I'm an "old school" Trek fan. I grew up on reruns of ST:TOS, was part of a Star Trek club in my teens, attended Star Trek marathons, have seen all the movies (and along with a co-conspirator, cut my teeth on borrowed slash zines). Watched a few episodes of ST:TNG, which didn't do a lot for me, but I know the characters. Haven't watched any versions of Trek since then except the first reboot (aka baby!Trek), which I enjoyed but in a distant kind of way. Zachary Quinto really captured Spock for me, and Uhura was a substantial improvement from "hailing frequencies open, Captain", but I didn't care particularly for anyone else. (I do quite like John Cho but mainly for being John Cho rather than anything he does as Sulu.) I am also obviously a card-carrying member of the *cough* "Cumbercollective". However, I've also clearly been reading too much ontd, because the first thing I thought on seeing BC was, "oh, there's My Glorious Lizard King". With the slicked-back hair and cold, cold eyes, I've had to concede they do kind of have a point.
Anyway, having outlined my background I would say that this particular combination is possibly the most challenging one for seeing this movie and having coherent thoughts afterwards. When JJ said he didn't make this movie for the Star Trek fans ("I didn't make him... FOR YOU!"), I now get where he's coming from. In this case I don't think this movie would affect you in the same way if you weren't ever a fan of ST:TOS with all its echoes bouncing around in your skull, or perhaps alternatively, if you weren't a fan of BC and his performance in other things. I actually came out of it giggling because I just didn't know how to feel - it felt like some massively meta-AU-prequel-sequel-reboot-crossover-only-in-fandom thing, and at times I found it completely, inappropriately hilarious, while at others I felt shamelessly emotionally manipulated... but it worked anyway. The strings were right there on the screen like thick black lines, and the movie was pulling on them for all it was worth, and it still worked - and to be honest, that really bugged me. I couldn't help being genuinely moved in all the correct places (dammit), but at the same time I could hear the little cackle of directorial triumph in the background, and I deeply resented it. Which is kind of applicable to the entire movie - it worked the way it was meant to, and part of me really enjoyed it, but it also greatly annoyed me in various spoilerific ways.
Not even going to exempt BC from that entire bundle of "what did I just watch"? At times I found him absolutely hilarious when he wasn't supposed to be, mostly during action-related scenes (part of it was The Hair, which had its own personality), and at other times he had so much more presence than the people he was playing off that it felt like he'd wandered in from a completely different movie and thought he'd hang around for a bit, see what was going down in this universe. There were times he was predictably impressive (but also a conduit of the shameless audience manipulation mentioned above) and at least one moment where he was fucking terrifying. He was like pure Voldemort without needing the make-up, and I may have actually flinched. On the whole, though, it was firmly a Star Trek movie, and Harrison is really a side note - like War Horse, I think the publicity exaggerates his role a fair bit. ZQ was lovely as Spock (again), Uhura was an odd mix of kick-ass and annoyingly unprofessional, and I enjoyed Scotty and Bones in a way I didn't at all the first time around. Sulu and Chekov were mostly just... there, with I'd say one good scene each. CP seems to try so hard as Kirk, but it feels like ZQ does all the heavy lifting in that on-screen relationship, and indeed, much of the movie.
I also realised this is the first time I've actually seen BC in a movie on screen (I'm excluding Frankenstein, which was a filmed stage production, and hence didn't include, say, massive close-ups of his face). That in itself was weird *g*. [lobelia321 reminded me that I had seen Tinker Tailor Soldier Spy, which is true! I don't think it had the same impact, though. It's the hair...] I think much of it was very enjoyable (and I wasn't ever bored), but I still have a confusion of feeling about a great deal of it as well. I don't particularly need to see it again, but if I do, it'll be mainly because ZQ was lovely (even though I don't care about him as an actor at all), CP was sweetly sincere throughout, although I'm not entirely sure about his acting. BC was more-or-less just a compellingly villainous bonus.