This is one of the books which I call 'the completed'. What I mean is that it is a novel thought through and intentionally written. I felt that Anne Bronte did a great work. Not just wrote what came to her mind. She had really paid attention for many things, it is obvious when you are reading this book. 
 The best part and an essence is the world which she showed us in the book, mostly life of a governess. Without big melodrama, but also without 'prince from a fairy tale'. Through the people who she met in her life we learnt about society and people in those time, how they really felt, dreamt, thought. And character of Rosalie is a masterpiece. 
 I don't agree with many opinions of Agnes but it is irrelevant. Because a really great book is when you don't have to like characters to like a book. (Let's be clear, I like Agnes I just have other views in a few matters.)