There is no rating for the new lessons. Pretty sure that's deliberate and not a bug. The "old" lessons still give and take points though. As you said, getting a rating based on your academic prowess rather than chess skill was always a bit strange anyway and seemed just a way of boosting bruised egos (mine was always about 500 points higher than any of my real ratings).
They are great though; I heartily agree even if I am tempted to call them low calorie or "lite" lessons.
I really like the new lessons format and content. Hope more content will be added soon.
Only: There seems to be a bug in the rating function, my rating does not change at all. Not that it really matters though, the concept of rating lessons seems a bit strange anyway.