I gave it an Above Average but I think I'd have to classify it as "very good" or a B+.
The production value was top notch. The acting was very good for the most part and the character moments were great.
However, the plot just wasn't very good at all. It ultimately suffered from the same problem every other Trek film has: little substance, massive plot holes, forced plot points, and trite villains.
I also thought the pacing was terrible. I've never seen and of Abrams TV, all I really know of his work is MI3 and it's really clear he's not a very good director.
I'm not even going to bother with the lens flares as they've been discussed to death already.
He just doesn't seem to have the best grasp of space. (Both literal and figurative.) A lot of shots were framed poorly and some of the lighting really made things feel cramped.
Also, a lot of the exterior stuff lacked scope. I'd be the last person to praise Meyer, but at least he understood this. It's effen outer space!
I also don't like the rapid cutting. I know it's the new "thing" these days. But I've never liked it. To me that only thing that ends up getting cut is content.
This is a symptom of my biggest gripe: the awful pacing. It was like Star Trek for ADD kids.
Right from the beginning all the cutting back and forth to locations and and four time period jumps in like ten minutes really was a lot to swallow. And frankly, the whole Kirk as a kid in the Corvette bit was totally pointless. But this rapid locale and time continued throughout the film. There was never enough time to let anything sink in--especially the important parts.
These are the ones that really get me. You have these highly emotional scenes and they're basically treated as filler. Abrams failed miserably at capturing the moment with any of them. It's like, okay Mom's dead, planet blowed up, let's move on.
But his also goes back to his poor shot framing. Take that scene on the transporter with Spock. He just watched his mother die horrifically and his entire species has just pretty much been eradicated. Certainly, from the other stuff going on, I can pick up on that. But visually, it's completely vapid. After all, film is a visual medium and if I turned the sound off I really don't "get" that. For all that I could tell, Spock had just lost his dog in a transporting accident.
Then of course, we're right back to the action.
It's really too bad, because I think this could have been one of the better science fiction films of the last twenty or so years in the hands of a better director.