You have to go through the report's methodology to understand what the scores mean. Are they measuring the state of mental health in each state, or are they measuring specific components of a state's mental health system -- some of which may be relevant to most people, some of which may not be.
Given NAMI's exclusive focus on "serious" mental "illness," what they're rating and measuring is indicative only of that -- that getting government-sponsored services in most states for serious mental "illness" is still not where it would be in an ideal world. I suspect the public health system would fare only slightly better in such a report card.
John