Yes, Harry is spending a lot of time lecturing on philosophy, but he's teaching. In fact, he's teaching the students to think, and that's terrific. His points are well-thought-out and well presented. Hogwarts doesn't teach logic or ethics; Harry is filling in a major gap. Besides, he's interesting. I love his stance on many issues. Personally, I think that Defense (as opposed to DADA) should probably include some sort of objective analysis of the Prophet...
Great job, as always.