WASHINGTON — Anonymous evaluations of professors by their students can be caustic or catty. But they are also unfailingly candid, and collectively they paint a revealing picture of a teacher’s strengths and weaknesses.

Over the last decade, about 350 law students at Harvard, Yale and Georgetown expressed views on classes offered by Judge Brett M. Kavanaugh, President Trump’s Supreme Court nominee. With rare exceptions, they praised his mastery of legal materials, intellectual rigor, fair-mindedness and accessibility.

“I honestly believe I took a class that was instructed by a future Supreme Court justice,” a Georgetown student wrote in 2007.

Judge Kavanaugh’s students did not hesitate to criticize the casebook he used (“the textbook is horrible!”) or to comment on personal attributes not particularly germane to his teaching (“great hair!”). Many students complained that there was too much reading. Early on, some said he was repetitive and not well organized. There was occasional griping that a few students dominated the class discussion.