I do agree with what you posted (not necessarily the race aspect, I'll leave that to somebody else and another thread). However, as the article indicated this tread applies "at all but the most elite schools." In law, that is generally considered the top 10 (there are actually 14 schools that rotate in and out of that group, so maybe top 14). At those schools the curve is very high, typically between 'B' and 'A-'. The students are distributed fairly evenly around the curve, and this produces very few grades in the 'A' to 'A+' range and very few grades in the 'C+' range and lower, so even those towards the bottom of the class usually don't have a significant # of 'Cs' on their transcripts. The jobs open to these graduates offer between 2 and 3 times the salary and/or prestige of what is being offered to the top of the class students at lower tiered schools.
I can tell you from experience that many employers don't even look at a transcript before they interview students from top 10 schools. Hiring is based primarily on personality and interview skills.
However, outside the top law schools (top 10, 14, whatever), I think what you posted is correct. Most employers see very little difference between a tier 2 and 3 school (or even lower tier 1 for that matter). And, students from these schools usually stay in the same region of the country as the law school from which they graduated because their law schools don't open doors to the national market.
Part of this problem is the result of too many law schools. I have always thought that a well-trained poodle could get into a law school, but that getting into an elite law school is on par (and maybe harder in some instances) than getting into a top graduate school in other disciplines (medicine, business, PhD). On the other hand, getting into a medical school is tougher, but there might not be a huge difference between an applicant only accepted at a middle tier med school and one accepted to an elite med school. In addition, because med students have to take the boards while in school, residency programs have more #s to compare, thereby eliminating some of the prestige factor associated with attending a top med school.
The bar exam is taken after law school and is only pass/fail in most states. I have never heard of an employer requesting bar grades. The only thing that is important is a pass.
I know this is a long post to make a nearly meaningless point, but I am bored...