What US MD school says MCAT isn't important? Most schools seem to either imply or explicitly state that the MCAT is one of the most important selection criteria. I work at a med school that focuses much more on softer qualities and demphasizes stats much more than most schools, and even the faculty there told me when I was studying for the MCAT that doing well on the MCAT should take priority over anything else I was doing to try to prepare for med school.
The catch though is that a low score can hurt you a lot more than a good score can help you. As long as your score is competitive for the schools you're applying to, just about everything else in your application become more important. If your score isn't competitive though, then you're not competitive without an amazing app to compensate for the low score.