The only evidence I have is being a former med student at place in question 😛 Also, with all this debate of schools tunnel-visioned on the boards, you guys need to remember that years 1 and 2 are primarily non-clinical at most places, and the curriculum may be focused on the boards. You can get excellent clinicals as a third and fourth year, even if your school is somewhat "boards focused" during years 1 and 2.
Whats wrong with having a curriculum that teaches to the boards? The USMLE's primary focus is to see if you have a certain threshold of knowledge to be a good physician, not to weed you out (like so many of the tests you may have taken previously). Schools that teach you well and those that teach to the boards are not mutually exclusive.