Counterpoint: "Memories of Feynman's lectures" at http://www.feynmanlectures.caltech.edu/I_90.html http://www.feynmanlectures.caltech.edu/I_90.html Every time

Counterpoint: "Memories of Feynman's lectures" at http://www.feynmanlectures.caltech.edu/I_90.html http://www.feynmanlectures.caltech.edu/I_90.html Every time this topic comes up, someone says they heard nth-hand that the lectures didn't work. I suspect it's folklore that grew out of Feynman's disappointment expressed in his preface. I studied them together with the official text in my undergrad courses, and found them helpful, FWIW.