I can't say that I'm a Trekkie, but I followed the series pretty closely. None of the spin-offs appealed to me. Having said that, I very much enjoyed this movie. I thought it was a very clever reboot to the franchise. The pacing was excellent. It managed to re-introduce us to the character of the characters and maintain high octance action. I'm glad it didn't weigh itself down trying to convince me with an extended who-was-who salespitch.
Everyone got adequate screen time and maximized it fully.
Personally I didn't think anyone could replace Shatner, and actually I've yet to see anyone do so...this new Kirk is an adequate reinvention. Everyone else was so good that I'm willing to give him a pass. I'll reserve my opinion on him after the sequel. Now he seems unlike Kirk in that he's a rash hothead while Kirk was somewhat methodical and cool in his approach to problems.