I think the feeling of negative reviews is more that most of the people who post about Nobles are posting about college matriculation. “Nobles has a great college matriculation so if my kid goes there he/she will get into an Ivy” which leads to a rush of people explaining why Nobles has that matriculation data and that comes across as negative.
Also, Nobles is really a day school. So when people are comparing to the the BS in the area it is a hard comparison.