People should not misinterpret these ratings either! Without A's and the majority rated as C it makes it seem rather negative, but I looked into it and on their website they explain how they came to these ratings.

"Other rating agencies use a scale from triple A to single C. In that scheme a B grade is “junk” and a C is close to failure. In contrast, Weiss Ratings’ B is “good” and C is “fair.” Based on a study of the Weiss Ratings by the U.S. Government Accountability Office, an institution is not categorized “vulnerable” unless its grade is D+ or lower."

So basically everything that gets a C is counted as 'fair' and B's are 'good'.
With this in mind, it gives a new dimension looking at these charts.