IMO, it’s ugly. Architecture done well or badly is in the eye of the beholder; I don’t believe in absolutes in any form of art (a lifelong debate with my artist FIL). The OP is asking for opinions:
My opinion is that the latest buildings on the Choate campus do not harmonize with existing buildings and surroundings. Plenty of Choate students and parents disagree with me, and that’s OK. I just don’t see beauty in any form of modern architecture on or off campuses.