Two great points here: (which merely means that I agree with them!!)
1. There is a tendency in some academic circles to read books about a book instead of reading the book itself. The book should always be the primary source.
2. Reading eclectically through literary genres exposes us to a wide swathe of the English language. It also allows us to consider why we like some works and not others. The analysis of the question, "Why don't I like this book? (painting, film etc) can be very fruitful.