For me book I wasn't a major game, my main complains was that fights could have been more diversified and complex, that a bit to many book/contents reading was not a pleasant reading, and that the game was too small.

But it was still a very good remembering, with good fights anyway, a global story interesting, interesting exploration, some ok puzzling, nice graphics, RPG contents enough developed to grab me. So I'll get the Book II without even wait or try any demo.