I liked the addition of Nicholae (spelling?), just the sort of hedonistic aristocrat I picture the coven having, moping around in excess most of the time and a complete contrast to Selene and the DD's.
Overall it's an interesting look at what the story would have been based only on the original film and had some good secondary characters, as much as I love RotL it suffers from a total lack of Sonya's mother.
But there's something about the blonde helpess "damsel" Sonya that made zero sense to how it stayed Viktors hand from killing Selene. That's the main problem I have with the older interpretation of her.
I guess I was doing lots of historical research about the Dark Ages and got too caught up in the idea of what a medieval lord's sheltered daughter would be like in real life, forgetting that that Underworld
played by its own rules where vampires and lycans were concerned.
I should mention, though, that the UW folks were unusually helpful and accessible throughout the whole process. Danny McBride and Kevin Grevioux, in particular, were always happy to answer my questions about UW lore, if they were able, which is not always the case with movie tie-ins. Heck, they even invited me to the gala red-carpet premiere of the first movie--which, again, doesn't always happen!