I drew a MDS plot for genetic relatedness of world populations (average Fst values) and got a RSQ value of 0.93. and a stress value of 0.07362 for the plot.
RSQ aka R-Squared is a statistical measure of how close the data are to the fitted regression line. It is also known as the coefficient of determination, or the coefficient of multiple determination for multiple regression. 100% indicates that the model explains all the variability of the response data around its mean.
if you analyze a physical process and have very good measurements, you might expect R-squared values over 90%.