Well, I suppose the series has improved for me already.
If you can consider going from bland (with-potential) to outright disliked.
It's just been amplifying what I didn't care for in first books. It's not that long, fits several group activities and I have been determined forever to finish this third-book-will-hook-you book. Otherwise, I think I would have DNF'd the thing.
Unless really changes in remaining pages -- I've definitely had it with Harry Blackstone Copperfield Dresden. I just don't like being in his head or the story or the side characters (okay, Mister the kitty hasn't annoyed me.)