I think it is up to the reader's taste, mine is - alas, precise quotes, locating from where the author draws his statements, so I can either cross check or persue the sources the author is using, aquiring a hint of what use memoirs could be, etc., I like things like those essays as of Dumas in his book neuf moins de Campagnes, narrative history should be backed up by such short chapters.
I don't like books like Eltings Swords around a Throne where you cannot follow the authors's statements and were you can one could find out that they are not true or just expressing the immagination of the author, so a good narrative but misleading.
Further it is not the book as such but what is made out of it, like when it is believed to be the ultima ratio about a topic and held as sacrosanct biblical text, one has to compare sources.
Basscially I don't like narrative history books and in case I like to be entertained I would read a historical novel, like Erckmann and Chatrian or a memoire.
This taste is not trendy - there I learned from postings that most people prefer a well written stroy regardless of what content.
Hans - Karl