Let me begin with the good things. The series takes place in the UK, so your entire world view is England, Wales, and Scotland. Which is interesting in its isolation. The handling of the Celtic deities and mythological creatures is fascinating. The "higher" powers, the beings from Otherworld, humans cannot focus on them well. It's a unique angle on the unknowable. On the other hand, I still didn't care about the six main heroes, Church, Shavi, Ruth, Laura, Veich, and Tom (True Thomas, or Thomas the Rhymer, from Scottish mythology). Their emotions and feelings are 'told' and repeated in the same words, which gets annoying, not 'shown' in actions or dialogue. Nor do I care about their predicaments or their inner flaws. No one seems interested in doing any research on Celtic deities or mythology to try and figure out what to do or what exactly they are up against. Tom's cryptic answers and questions just seem annoying, instead of urging them on to discover their own inner answers.
**SPOILER ALERT**
With Ruth "carrying" Balor, she accepts it way too easily, as if she's carrying Church's kid instead of the leader of the Formorii. She is supposedly chosen because she is the "strongest," but that is never shown, either. Laura's sacrifice seems pointless (I won't further explain!), but I'm glad she wont' be around to be the character to only add glib and sarcastic comments, as she puts it to Church near the end.
**END ALERT**
Yes, I will still read #3 because I want to know how it will end. My prediction is that if the "dark side" does win, the book will feel unfinished, like nothing was really accomplished. And if the "good guys" win, it will feel like a happily ever after fairy tale.