It is, no doubt about it. As I said, I've watched the "Phase II" stuff that James Cawley and co. have done, and I think they're great. But that's a continuation of Trek, and made by fans for fans.
This film has not only to appeal to the fans but also to a wider audience, if it is to succeed in re-energising the franchise (which I think it will). It's also a reboot, rather than a continuation, and the differences with the way the characters are portrayed here - younger, more brash, with different interpersonal relationships than we're used to in some cases - does take the edge off the enjoyment, for me at least.
That's not to detract from the actors in any way, as the performances were uniformly good. It's just that, for example, I couldn't really relate Chris Pine's portrayal to the James T. Kirk I know until the point where he took command of the Enterprise (his path to command rank is the single most implausible thing in the entire film, by the way). THEN I started to see the old Kirk.