Do you think if a teacher is blaming their students for not being successful it perhaps could be a sign of a crappy teacher?
I'm not sure it is fair to say Moulton was "blaming" his students, but leaving that aside for a moment and answering the question: Maybe, maybe not. Sometimes it's the teacher. Sometimes it's the student. Sometimes it's both. Sometimes it's just a bad teacher/student fit. Sometimes it's a result of factors beyond either one's control.
But when the teacher/student thing clicks, magic happens. Witness Dave Moulton and Russ Denny.
Now get off my lawn . . . .