Just got back from seeing this and really enjoyed it.
I give it an 8/10 or for this poll a 4/5.
Really liked all of the cast, thought they did a great job. I just wish Bana got some more scenes but he had more than I thought he would since a lot of people were making it sound like he only got two throughout the whole film. I'm kind of in the middle on his character. Part of me thinks his motivations were fine since he lost his entire planet/civilization but at the same time I agree that he could have used a little more background to add some weight to his anger.
The cast did a damn good job taking over for this new film series. I think the weakest of them was probably Yelchin, he still did good but if I had to pick one of the actors/characters that I wasn't fully happy with it would be him. I kind of miss Walter Koenig's take on it. Chris Pine did better than I expected. I'm glad he did his own take on it and didn't try to mimic Shatner's style of talking, that would have just come off as a parody almost. My favorite character from the original films was always Dr. Leonard McCoy and I felt Urban kicked some ass in the role. I was grinning ear to ear with most of his lines.
One thing that came from nowhere that I felt was kind of weird was Spock(Quinto) and Uhura's little fling going on. I really only watched the original films and not the TV series growing up, I think I've seen only around 10-12 episodes of it so I have no idea if they had a liking to each other in the show but from what I can remember I didn't think so. I guess it's a little better than having her get with Kirk since that would be a bit cliche' since he's #1, you know...the Captain.
The action and effects were damn good, that is pretty much the biggest draw for members of the general audience who never liked or cared for the originals. I say it's the biggest draw for them because although I may not be a trekkie, from watching the old films I think the dialogue and characters in this new version still felt like Star Trek. It might not have been as technical/nerdy as the originals but it had that nerd vibe still(which is a good thing for this franchise obviously...can't be everyone's cup of tea, not making fun of any trekkies by the way when I say this since I myself loved most of the old films) that I'm sure a good number of people might still not care for.
All in all this was a great and fun sci-fi adventure. I went and saw it with my gf and family for Mother's Day(my parents are huge fans of Star Trek) and my parents were really interested in seeing a sequel with these new actors. Which is surprising coming from my Dad since he went in to the film not sure if he would like it due to those new actors. I don't blame him though, while he's not a hardcore trekkie he's definitely still a huge fan of the original series and films, I knew he would miss the original cast.
One last thing, I was kind of pissed that I didn't notice the Tribbles in the cage on Scotty's desk when Kirk and old Spock first meet him. My gf pointed it out for me but it was too late.

Still a pretty cool nod to one of the more commonly known episodes of the series.
8/10