I look at the believability of a film, the story, the characterization, the effects, and many other elements when making a judgement. And I thought Star Trek measures up pretty darn well in a lot of departments. Sure, it isn't perfect. In fact, I have had my own personal little nitpicks with it. But they are easily forgivable in light of the majority of the film. Now, whether you enjoyed it or not is a personal taste preference I think. But to suggest that the film is serious flawed? I just don't see it.
Now, Transformers 2, Crank 2, Transporter 2, Quantum of Solace, Indian Jones 4, Die Hard 4 and Ghost Rider are seriously flawed films. They are just mindless entertainment in it's highest form. At least, in my opinion, anyways.
Also, to say that a film is good based on the fact that it has the title Star Trek in it is simply not true: In fact, general audience that brought in money for this film and not just the fans. Also, it was favored by critics, as well.
And as you know:
Recent previous Trek films didn't do all that well at the box office or with the critics.