I couldn't have said it better
I always take notes on my laptop as I read - usually I'll do my reading for the day, and once its done write down my thought, impressions, and where I think the story might be going. I add to that until the book is completed. I don't 'analyze' the book as such - writing style is the only thing i'm critical of, but thats a huge part of a book. Other than that, its merely whatever jumps out most at me. I never used to do this, but regardless of reviews I got sick of not remembering why I liked books.