The Ranger's Apprentice series is a solid fantasy series with interesting characters (particularly Ranger Halt) and good writing. The fantasy world is fantastical without being so complicated it is impossible to keep the geography and language straight.
Although not genius or good-v.-evil epic, each book is an enjoyable read, and unlike many series, I think they got better as the series went along. The Emperor of Nihon-Ja is the 10th and final book in the series and it wraps everything up in a satisfactory manner. Although this series is considered a children's book, I am an adult and I recommend it for all ages