Personally I think some of those raters are talking shit. The ones who say he's helpful are speaking the truth are right, he is one of the most helpful lecturers I've encountered. As for "easiness" how can you rate a lecturer on that? The course I did was easy though - political philosophy isn't hard at all. And he doesn't "expect a lot" from his students, you just need to read the material. Actually I haven't been reading the material because I feel like I grasp the concepts without it. I tend to read the stuff that is on recommended reading but not the primary reading, because when I read the primary reading I never draw anything new from it.