Just saw the film a second time, and I'll repeat what others have said - this film doesn't need saving. Its a rousing adventure and fine introduction to Star Trek for a new generation. If it did need saving, though, Trek fans are the last people I would want touching it. First, we don't have the perspective necessary, and second, well to be blunt, most of us just don't have the talent.
I've seen my share of fan fiction over the years, and I'm sorry to say most of it is execrable. Too many Trekkers write stories that rely on obscure - logical, but still obscure - technobabble, or fifteen minute scenes where the characters debate some moral dilemma, or leaden dialogue that unintentionally parodies the worst tendencies of later-era Trek shows.
Funny, after a quater century watching Star Trek, I've come to a realization. Most of us obsess over minutia at one time or another, but only when a movie or show rubs us the wrong way. The truth is, Star Trek, regardless of the incarnation, is rife with unlikely coincidences, inconsistencies, and illogical choices. When it happened in TOS and DS9, I excused them, because I liked the shows. When it happened in VOY, I tore them a new one, repeatedly - and in retrospect, unfairly. But why? What was the defining factor? I can't speak for anyone else, but for me, it always comes back to the characters, and how they make me feel. If I respond to them - to their personalities, to the dialogue written for them and the actors playing them, I'm willing to let the rest slide.
Sure, if it were up to me, I'd make their world as airtight and believable as possible. Yaeh, there are a few nitpicks in STXI I would have corrected, if I had veto power over the writers and producers - a line change here, a different planet name there. But in the whole, they did what they had to do, they made the characters real and fresh and human, and I cared about them. More importantly, all those other people out there - who don't care about Delta Vega or red matter or why Spock was in that particular cave - they cared about them too. That's the storyteller's first and only real job, and JJ knocked it out of the park.
But still, Orci and Kurtzman, if you're reading this, I am totally available to give advice on the next one.