Feynman was not a great teacher. Lots of people love his lectures now. But they're not getting graded on it.
Actual students were considerably more mixed. Obviously individuals vary so if I post how most of his students were totally lost in class, they'll post how one student went on to win a Nobel prize and say gotcha.
There are two types of teaching. One is teaching things to a complete beginner. The other is teaching things to someone who has already mastered the mechanics of a subject.
Feynman was a world class second type teacher. If you already know how to work with physics equations and solve problems, then Feynman's lectures will improve your understanding considerably. The simplification process he does, gives you a grand understanding of the theory.
Due to this, much of Feynman's pedagogy is not suitable for the first type of teaching. And should not be used as such.
This reminds me of University Physics by Young and Freedman. The things I already understood were really dumbed down, and the things I didn't understand were inscrutable. I ended up using it as a door stop for the rest of the year until it fell apart and I had to throw it away. It was one of the first ones where the book came with a code that you had to use online to do the homework, so the book was also useless as second hand, after being useless when bought new.
Actual students were considerably more mixed. Obviously individuals vary so if I post how most of his students were totally lost in class, they'll post how one student went on to win a Nobel prize and say gotcha.