Okay, so I'm definitely seeing one of the biggest complaints being that the Enterprise has to save Earth yet AGAIN. In that, we definitely agree. Though I'm glad they dropped the whole "The Enterprise is the only ship in the whole galaxy that can do a damn thing" convenience, I want something new. The Enterprise's mission is to seek out new life. Let's see that for the next movie. I think that's what they're probably planning. This movie followed the typical super-emergency that can justify everyone being where they're supposed to be. IMO, that's why the original theme music didn't show up until the end of the movie. They weren't there yet.
And I for one don't want to see re-hashes of old stories. Let Khan lie. Steer clear of the Sigma Draconis region. Stay away from Apollo. Though the Planet Killer would be cool, save that for at least a while so we don't have two movies in a row about things killing worlds.
Also, to put the Enterprise debate in perspective, the NCC-1701-A was 288.6 meters in length and had something around 400 crew give or take. The USS Enterprise CVN-65 aircraft carrier is 342 meters in length and has a crew of around 3000. See the problem here? An aircraft carrier that's been in service for almost 50 years is bigger than a 23rd century super advanced starship. Whereas the new Enterprise is around 725 meters in length and contains around 1000 crew. Sounds more reasonable to me.
And another thing, Pike said, "Your father was captain of a starship for twelve minutes. He saved eight hundred lives." Not crewmen. Lives. People. There's nothing precluding the possibility that there weren't some passengers or what have you aboard. They didn't necessarily have to be crew. Also, I believe that most Federation starships have had the capacity to almost double or triple the required crew complement if they need to house refugees. Again, makes sense when you think about it....logically.
Oh, and apparently George Lucas likes the new film. From the New York magazine: "I liked Star Trek growing up and I?ve seen the new one," Lucas told us, shortly before taking off at warp speed in the opposite direction. "It?s good. I liked it." But, we wondered, was there anything he?d have changed about the movie? "No, because I would never do a Star Trek." Thank the Great Bird of the Galaxy for that.
This pic from gizmodo shows what they believe to be the proper scaling of the new E:
http://cache.gawker.com/assets/images/gizmodo/2009/05/enterprise-vs-bsg3.jpg Hmmm...still would get it's clock cleaned by a Star Destroyer.