Doctor, I watched every episode and the main arc does reach a conclusion, though there are threads left for a continuation, had it been renewed, and the fate of a couple of characters is left unclear.
Since you're a Big Finish fan you might enjoy it because it is kind of a pastiche of some of the themes of the novel and the various films--in the same way that the Big Finish stories tend to have sometimes an oblique or speculative relationship to their source material, be it the DS stories or stuff they've done from other fandoms. There is *a lot*, IMO, in this DRACULA that kind of nods to elements of various DS plotlines, as well.
G