This movie is not for the young (younger than 11, I'd say), or the faint of heart. But it is, quite simply, one of the finest movies I've ever seen. This is a film of devastating beauty -- in the visual, the aural, the story, the messages. The technical achievement is masterful indeed -- masterful enough that it doesn't distract, which is a wonder in itself. All that said, there's nothing worse than going to a movie and not enjoying yourself because your expectations are set too high. So stop reading reviews, don't expect a whole lot, and go see this movie. You might be pleasantly surprised. :-)
Focusing on well-defined characters and a great story, Abrams and co. deliver the best Star Trek movie ever -- by a wide margin. You care about these characters, and you see something rare in fiction: Real character development. Yes, for Trek fans, aspects of the story do not reconcile perfectly with the original series, but A) a reasonable rationale is provided for most of it; B) It's a great movie, so who really cares?
Sole downside: If you expect "fantastic," the best it can do is meet expectations, right? But this movie deserves to delight & amaze first-time movie-goers. When I go see it again (a rarity for me), I will be faced with a similar conundrum. But then I remember this fantastic movie and I ask myself, "who really cares?"