Rubenstein bemoans testing culture's effect on Math education and suggests a better way forward. I feel his pain but think he's only half-right.
Gary Rubenstein in his "The Death of math" blog post is spot-on about the short-sighted nature of de-prioritizing away from vital skills like geometric proofs as a result of standardized testing pressures. Proofs are geometry and are by far the most valuable aspect of it. And it ain't about the math, it's about the way of thinking that geometry proofs cultivate (yes, I'm an English teacher that has come to love "ain't"--deal with it!).
But Rubenstein is a bit behind the times in the Khan Academy era. Sal Khan, my former boss and co-worker (a fact that I will brag about until the end of eternity), has worked out a better solution to a lot of the issues that Rubenstein tries to solve.