I have generally had better experiences with MD interviewers as well. However, I think that my PhD interviewers may have a negative preconceived notion of me before I walk in the door just because I left a PhD program to go to medical school. You try telling a PhD why you left a PhD program... no matter how much you say that you greatly respect the work that basic scientists do, it has to be a little bit of a slap in the face to say that it wasn't the best career fit for me.