I agree with Briv; however, the Piano design is too subdued for its context, which isn't the Boston's elegant 19th century neighborhoods (though they're all rococo by comparison), but rather its collection of squat striped borwn boxes. Better proportions and nicer skin aren't enough to set it apart, much less to steer Boston in a more daring architectural direction, which by its prominence it's uniquely positioned to do.
The alternative, however, need not be the exhibitionism a la St. Petersnurg (which I dislike, by the way); we need something to steer a middle course, distinctive without being flamboyant. Piano may be the right person for it, but this design needs a twist. I think any of Foster's skyscrapers, or Rogers', would be great examples.
Speaking of twists, remember the iteration of the new WTC design (sorry, I can't bring myself to use its official name) with a torqued triangular grid? It needed work, but I felt it had more promise than anything before or after it. Some subtle torquing would give the Piano tower just enough interest while still working with its surroundings,
justin