That is an interesting dilemma, yeah. To be a sharp homework-hammering undergrad is not to be a good researcher & fuzzy situation manager. It's why there's such focus on undergrad research these days, it helps identify the capable people and build their skills (as well as getting some amount of budget help).
The professor at Brown clearly enunciates some of the issues with the current system quite well.
But to make it a meaningful experience (and get out of it with a PhD) you need a wholly different skillset. It's clear that you have never seen a kid who destroyed the productivity of a whole office because he treated his colleagues Just Wrong, and that you have never seen a fellow who just couldn't transfer what he learned in class to real-life application.
That's harmless. But if you have someone who continuously messes up shared equipment, leaving it for the next person to fix, and who won't improve their attitude, no matter how often you tell them, that's deadly for morale.
That's not as true anymore. If you did some interesting independent-research projects as an undergrad, which you got published as conference papers, that strongly overrides your undergrad course grades nowadays, at most schools. Basically publications trump everything, and grades are only used if you don't have any publications.
