That The Feynman Lectures on Physics (FLP) is unsuitable as a text for teaching beginners physics is a popular misconception, which you can read more about here. In fact, FLP was used for almost two decades as the textbook for the 2-yr introductory (freshmen and sophomore) physics course required of all students attending Caltech (regardless of major), most of whom had no background in physics nor any calculus before taking the FLP course at Caltech. The only real shortcoming of FLP as a physics textbook, in my opinion, is its lack of exercises; My colleagues and I are currently addressing that problem and hope to publish an exercise book for FLP later this year.
Michael A. Gottlieb
Editor, The Feynman Lectures on Physics
www.feynmanlectures.info