When I first heard they were doing a new Star Trek film that was going to focus on the original characters (Kirk, Spock, etc) and explore how they met and such, I didn't think much of it. The Star Trek films, in my opinion, had been falling behind the times and pretty constrained by the universe that had been established by the various tv shows. Anything they did that touched on the early stuff would be very constrained.
However, when I learned that JJ Abrams was behind it I started to look forward to the movie. Abrams is behind both the LOST and Alias TV shows of which I am a fan of both. His unique talent is in being able to take an existing storyline and just reinvent it every couple of seasons. He has been somehow able to just turns these shows on their head and go in a completely new and unexpected direction all while staying true to the major story arc. With the movie Cloverfield he did the same thing to monster films like Godzilla. So the question for wasn't if Star Trek would be enjoyable or not, but how was he going to reinvent it and would it work?
Well, not to go into plot and give away details, but this sure as hell is your daddy's Star Trek. I was worried they were going to wuss out at the end but they didn't. It looks like they have relaunched the Star Trek franchise in a way that will probably satisfy a good chunk of the Trekkies while making it enjoyable for a new generation of fans that don't care much for the old stuff.
This movie totally stands on its own. I sincerely hope they can keep the cast together and crank out some more stuff. The movie certainly sets it up to be able to explore a lot of stuff that I thought would have been out-of-limits originally.
Anyway, all of that is to say this. Don't think of this as a 'Star Trek' film if you don't like Star Trek. If you like action/adventure stuff you'll enjoy this. Fast paced, enjoyable plot, special effects are up there, wasn't much for the music but that is a personal thing. If you do like 'Star Trek' films and know the back story to the original series (with Pike and such) you'll probably enjoy this too. Just don't expect a traditional Trek film. This is a new beast and baby, I likey.