Much of the history article is taken directly from Hillsdale's website, and I would agree that much of it reads like an advertisement, but, in all fairness, there really hasn't been enough published on Hillsdale apart from the college itself.  I have tried doing EBSCO host searches and have looked for titles in my university library (the largest library in my state, mind you), and I have been unable to find a single title that is exclusively about Hillsdale College.  I suspect the reason is that, while it was once a radical college, it has become more conservative as the world has changed.  It was expected to become more radical, in the way that Antioch College did; but it didn't.  I think that the best solution is for outsiders to acknowledge Hillsdale's impressive history while still writing about it from an objective point-of-view.  If there are other people willing to write about the school, there will be less need to visit the "Imprimis" website to compose a wikipedia article on the subject.