Karl Urban as Bones and Anton Yelchin as Chekov really stole the show, in my opinion. Zachary Quinto as Spock and Zoe Saldana as Uhura also gave sterling performances. Simon Pegg as Scotty and John Cho as Sulu were underutilized, I thought, which was a shame. Bruce Greenwood as Pike overshadowed Chris Pine as Kirk, but Greenwood is a veteran actor and Pine's career is still in its infancy. I was saddened by the absence of Nurse Chapel, she was the one who should have been romantically linked with Spock (I would have cast Sarah Paulson in the role, personally. Loved her in The Spirit. Speaking of The Spirit, Gabriel Macht would have made a good Kirk). Ben Cross as Sarek and Winona Ryder as Amanda Grayson turned in fine supporting performances. Eric Bana as Nero was as contrived a villain as Shinzon from Star Trek: Nemesis, but that was more the writers' fault than the actor's.
I give it a thumbs up overall, but was not as blown away by it as I'd hoped. However, I intend to see it again and I do think they laid an adequate foundation for future films. Still, I wonder why Leonard Nimoy as Spock did not just tell them how to do a time-sling so they could either go back in time to destroy Nero's ship when it came through the original temporal rift, or (more Trek-worthy) jump into the future to either prevent Romulas from being destroyed or warn its inhabitants in time to evacuate them. The story was not horrid by any stretch of the imagination, it just could have been better and the pacing was uneven. This was no Wrath of Khan, no First Contact (which I feel are the best films featuring, respectively, the TOS and TNG crews), but it was as every bit as entertaining as The Voyage Home or Insurrection (which I consider the second best films of the aforementioned crews).
To summarize in conclusion, this was Trek, just not Trek at its very finest (but certainly not at its worst).
“In our every deliberation, we must consider the impact of our decisions on the next seven generations.”
-- Great Law of the Iroquois Confederacy