Excellent, 'Rawls-grade' application of Kant to contemporary philosophy, with an Isaiah Berlin style fluency with the historical literature. She also rights clearly on a complex topic, which is as welcome as it is rare.

In my opinion, things get a little muddled in the 4th lecture, but that might be due to my lack of familiarity with the contemporary versions of the issues. The responses included from other authors are even more of a mess, but since I know at least 2 of them (Thomas Nagel & Bernard Williams) are competent writers, I think it's likely a a consequence of the format than an actual confusion in their views.

Lastly: although Korsgaard doesn't mention the connection here, her technique of not simply describing the historical views in sequence, but also showing how the failures of the earlier lead into construction of the latter ones is straight out of the Hegel playbook. So, you know, bonus points.