Dracula 1

Stoker constructs the narrative of Dracula from a variety of documents: letters, journals, telegrams, newspapers, and so on. There is no central narrator or main character (except, possibly, for Dracula himself). What effect do these features have on the story? Do they make it more or less believable? More or less exciting? Is it harder to follow the plot because of all of the switching between narrators? Why might Stoker have chosen this structure for an action/adventure story?