Almost all of the cast was amazing. Perfect casting for almost everyone. My one question was about the Winona Ryder as Spock's mother turn, as she was always in age makeup. Either something hit the cutting room floor, or we could be looking out for a pre-prequel. Who knows.
Kirk, Spock, Bones, Scotty, Sulu, etc... All great casting. Kudos.
I loved the action. It was fun to see the Enterprise on the big screen in it's updated, yet still old school form. And the best part, it was funny. So much humor in the movie, it didn't lose the feel of the original tone and characters.
To address the time travel bit. They had to do it. Definitely a bit of "how convenient" and I'm not going to blow it by going on about it, but one scene wrote the filmmakers out of any present and future continuity gaffes. Pretty interesting way around it.
Great movie, go check it out! Now.
I think I might go see it again... maybe in IMAX!