One point in Stoker's favour is that Mina Murray, later Mina Harker, actually has rather an active role despite needing to be rescued (and actually it's her husband who is most in need of rescuing at the end of the first section of the book). She types up all the notes and distributes them; she knows the railway timetables from Varna (pretty damn impressive); her telepathic link with Dracula allows the team to guess where he is; and the men make a mistake, and admit it is a mistake, when they try to keep information from her delicate ears. Of course the other female characters who get turned by Dracula (including Mina's friend Lucy) are much more passive, but I thought Mina's role worth noting.
After an early reference to a Kodak camera startled me, clanwilliam pointed out that the book is all about technology - the camera, the phonograph, the typewriter, the railway trains. But this isn't rationality alone defeating superstition - our heroes also use garlic, crucifixes and consecrated Hosts (this in a book by an Irish Protestant!) alongside the latest tech. It's about the forces of good, with technology and teamwork, using all means at hand to defeat an individualist, primitive evil. (One of the more chilling moments is when they realise that Dracula is strong enough to hump his own coffin about the place; he works best without allies, and consumes his servants.)
Now that I know the Balkans and Eastern Europe to an extent, I was interested to check off the extent to which Stoker used reality for his setting (I believe that he never visited what is now Romania himself). Various people (including Ken MacLeod) have pointed out that all this vampire stuff gives the historically liberal and pluralist lush arable territory of Transylvania a bad name; the more isolated and geographically challenging Bukovina is the more likely location for the castle. I'm also a bit dubious about the eastward spread of the Czechs - I think Stoker meant Hungarians there. But he namechecks several local delicacies which I have eaten myself. I note that Harker takes the western route, tied into normal business practices of Central Europe, when he approaches the castle at the start of the book, whereas the final campaign is waged from the less developed and more obscure south-east.
There are some incongruities. Dracula has a moustache; I can never quite get over that. Also Stoker's ear for accents is not unerring; while I will accept his Cockney, his Whitby yokels seem to me to be under some Irish influence, and Van Helsing does not speak like any native Dutch speaker I have ever met (see my pedantic comment). I also don't quite understand why Dracula first imprisons Harker and then lets him go, except that the plot needed Harker's diary to get back. These are not fatal points.
There is probably more to say about deviance in general, and also Lucy's love life (is her vampirism punishment for having three boyfriends?) But I am out of space. Read it, if you haven't.