She is definitely the expert in Kant's moral theory. But I feel like she is not a good at explaining them clearly (compared to Burge's lectures on Kant's epistemology). Kant is hard, his invents new vocabularies for his philosophy, which makes it harder. Professor Herman's lectures are usually too dry and she keeps using those abstract terms without explaining them very clearly (might be my problem, but when the examples she gives are quite unintuitive sometimes, plus she doesn't really focus on using example to make things clearer to you, maybe she is counting on you to understand the terms or theories by yourself). Phil 151B is a great class about Kant's ethics, but IMHO there's still room for professor Herman to improve.