Long story made short - Bilas' thinks the APR isn't a useful measure of anything related to academic progress and it has resulted in some unintended consequences, such as athletes 'clustering' in certain majors.
None of it matters to us.
Semi-related note, if the Insider stuff is compelling enough to generate these threads, I would advise people to just subscribe. It's not expensive, it's pretty good and it includes the magazine. (Disclosure - I rarely read the magazine. The idea of a thing with printed words inside it is more and more foreign to my iPad-inclined brain. I stack 'em up and give them to my father in law.)