I could see people getting bored of this book and dropping it, and I wouldn't blame them one bit. I was interested in the historical aspects of it of course, of the whole blending of fantasy and history aspect, and that's what kept me entertained during the course of reading it, up until the 89% mark.
There is a specific feeling one gets after reading the final reveal of a book (especially if it's a long book), a specific type of disappointment, that's like a balloon deflating in your mind. That's the way I felt finishing this book. I won't say anything about the plot itself because it could be all a spoiler, but if you're somewhat versed in Dracula lore, nothing in this book will surprise or amuse you. Just get ready for lots of history and what I'd assume Bourne Identity would be if Jason Bourne was constantly stopping to tie his shoelaces.