Everyone says that about PBL schools. When I went to the McMaster info session last summer (Harvard hired McMaster educators to help design the NP), the same questions popped up about Mac students' board results. This is Harvard though, so the match of your dreams shouldn't be a problem. Congrats on the acceptance.
The funny thing was, one of the presenters said that Harvard isn't as PBL-oriented as people would think (at least compared to Mac, which is nearly all PBL) and actually has a fair number of lectures, though they may call them something else.