As much as I enjoyed this movie, all the glowing reviews tell me is that the mainstream still views SF as a bit of joke.
I think it's more that the mainstream doesn't view or evaluate sf as a genre with particular or peculiar values, but judges such films on the same basis as suspense thrillers, westerns (of a time), cop movies or adventure films. Taken on that basis, I think that Star Trek is a complete success and pretty clearly overshadows the other films this season that are competing for that mainstream "big movie" audience.
SF fans, a minority of filmgoers, are often looking for something more specific, a kind of intellectual or at least a certain flavor of stimulation of the imagination. There is no wide agreement even amongst fans as to what satisfies us in that regard but, somewhat after the manner of Damon Knight, we can recognize and point to it when we see it.
I doubt that it's happenstance that the most prominent negative review of
Star Trek in the mainstream press was from Roger Ebert, whose
bona fides as an sf fan are pretty solid.