I just saw this movie. I enjoyed it; it was entertaining. As a Star Trek fan, I can say that the series had died after Nemesis. There are only so many movies that you can make that appeal to a core audience, rather than a general one.
I am pleased because this movie was able to respect actual science (namely, quantum mechanics) and create a new direction for Star Trek. So, there are two timelines in Trek now. One which has Picard and Janeway and everything like that, and this one which is able to tell new stories completely untethered from the burden of its history. I completely positive this.
It was great to see both the sci-fi nerds and the general audience watching a Star Trek movie. The die-hards will be offended because everything they know is over, but it gives the series and the franchise new life, which is exactly what it needed. I'm pretty sure the folks at Paramount aren't losing any sleep over this.
So, go see it.