I got no sense of malignancy from my time at BU, and from talking to many current BU students.
I have heard that they work you very hard during your 3rd year (and I've heard that with the possible exception of the general surgery rotation, you're doing useful/educational work and not scut) with a lot of hands on experience that comes from working in a busy urban medical center. I view this as a positive, as it will be the best training for a future residency, though I'm sure there will be times when I wish it were a bit easier.
*disclaimer, this is coming from a BU 2014 student*