The revenge isn't really a major theme. She has a lot of understandable hatred, but a major theme of the book is her realizing that she's let that blind her, and getting past it. The revenge only really plays in when she gives D'Nathiel shelter after learning Darzid is helping him. After that, she just wanted to send D'Nathiel on his way, until she learned there was a connection with her husband. The fate of Seri's family was gruesome but, sadly, fitting with some historical attitudes, and could have been a lot more so.

It has it's share of flaws, but I think it did a good job in dealing with the revenge/disillusioned theme, especially as a lot of it was looking past that.