Basically, if you want to read Dracula, don't expect Castlevania. it's a very drawn out sort of novel. Lot of journal stuff, and it's not all OOOH ACTION so much as "oh look they are tracking the count down"
If you've ever seen the Jesus Franco Dracula with Christopher Lee, that's a pretty close adaptation of the book, right up until the ending, where it just abruptly cuts to transylvania and kills the count in the most anticlimactic way possible. I guess they'd blown their budget on the castle shit in the beginning and Christopher Lee. To the point; the movie is boring past the Dracula stuff at the start. The book is similar. It's not fast paced at all. it's rather slow paced. But I liked it anyway. I don't personally mind slower paced books. hell, i read mystery novels. Like, Agatha Christie ones. those tend to have a slower pace.
Actually, if you want a more quicker paced Dracula adventure, read Sherlock Homes Vs Dracula. it's got the pacing of a Sherlock Holmes story, but Dracula in it as the antagonist. It even manages to fit itself into the original book's continuity.