I agree that most of the advice is pretty obvious if you reflect on your and other people's behavior. Also, I grew pretty tired of always using a string of anecdotes as support. Sometimes they don't even seem to fit the current chapter.

However, I think the important point of the book is that Carnegie succinctly collects a small number of behaviors that will improve your social life if you apply them. So you might not learn something new in the book, but hopefully it will teach you to focus on these known things instead.