I appreciate anyone that wants to dig into and understand a metric or measurement. Having a candid conversation otherwise is worthless because the other party knows-not-of-what-they speak. That said, I too have been following the GSR metric for decades, and am dangerously knowledgeable.
A perfect tool won't ever exist, as it will end up too complicated. KISS (keep it simple, silly) is preferable for line-of-sight and ease of understanding. Imo, we have that with the GSR … so at least we can compare;
1) Sport-by-sport improvement or lack of within a university (Men's Wrestling at PSU, for example)
2) Comparison against the national average, by sport within a university as compared to the NCAA average for that sport
3) We can do the same, by conference, by entire university (the article above in OP), by Division, etc., etc.
It's not that it's a totally worthless measure, or gnats-eyelash accurate … but it is a good, solid, somewhat-easy-to-understand measurement.
I personally feel good about where PSU Wrestling is, academics-wise;
Here's past GSR's:
1998 - 71%
1999 - 64
2000 - 80
2001 - 82
2002 - 82
2003 - 91
2004 - 85
2005 - 90
2006 - 87
2007 - 73
2008 - 77
2009 - 70
2010 - 86
2011 - 100
2012 - 100