For the negative - past life regression as a major plot device and regressing to the Stone Age....ugh.
For the positive - I like that this is the first book in the series that starts to tie some of the threads together from the previous books. I like that we get to learn more about Night World and its history. And, finally, I really like the relationship here between Thierry and Hannah. I like that Hannah initially rejects Thierry when she believes he is a threat to her....teen girls take note.
Overall, more positive than negative and I'm continuing on with the series.