What do you think the purpose was in this kind of teaching style? Was Mr L just not very good at teaching this unchallenging material?
Given my grade in the class, I'm sure the student deserves as much criticism as the teacher...
In retrospect, I would say the most important lesson of the class was that engineering problems don't start out looking like problem sets. They start out looking like some phenomenon from the real world, and part of the engineer's job is to design the model, including deciding what is relevant and what isn't. Whether that was the lesson he intended to teach is another question.