Thanks to artistic director Diane Paulus, Cambridge's American Repertory Theater has become a pipeline to Broadway. With original shows and revivals, superstars (Bryan Cranston! Audra McDonald!) or unknowns, the A.R.T. has had a run of profound and well-deserved success. But between the blockbusters and Tony winners, the theater has dropped in little gems. "Sense & Sensibility" may be the brightest gem yet.
