Ah yes. Mothers may not, but writers certainly do have favorite children.... *g*

In this case, it really does sound like it's mainly personal taste influencing your feelings for the book, though. Maybe something to keep in mind for future books, if you want to focus more on themes that really get you excited... But I'd say you've given it enough consideration not to be really concerned about it.

Still, disappointing when you put a lot of work into something, the end result's a decent piece of work, and yet you still can't really get excited about it.