Avg rating should be the primary metric. It's not like some schools have a higher scholarship limit. Every school, over 4 years, will have doled out the same number of schollies.
I'd love to see one of our resident statisticians compile a weighted, 4-year ranking based on average stars and see how that measures up with the current top 25-50 in the polls or whatnot. Compile the 2011, 2012, 2013, and 2014 classes. To calculate overall impact on the field for this year, multiply the averages by seniority which factors in projected playing time by class. Current seniors and juniors (2011 and 2010 recruiting classes) would be weighted at 1.0... then sophs at .75... and RFs at .25. Just an idea, but I'd be surprised if there was not a strong correlation to the star-system when all is said and done.