Yeah, I always felt like pass rate was a pretty useless stat to display anyway. Im not super impressed with someone passing boards after two years of schooling directed at excelling at boards.
More telling/impressive would be average board scores, I think. With a big enough class size, and if they would through out outliers, etc, then this could be an interesting evaluation tool for a schools curriculum. Im sure they track it, but I've never seen them share it.