I enjoyed the latest book very much. It wasn't perfect, of course, but I look at it like this: I regard the third book as the best (so far) because it was very climactic. The first two led up to it, making it a mini climax--kind of like an ending of the First Act (in 3 Act story.) So I regard the books afterward as leading up to another climactic book. Whether it'll be the sixth book that's a mini-climax like the third, or it'll be the seventh and final one that's a slam-bang climactic finale - still remains to be seen.