It's a great movie, for precisely the reason that it's not Narnia. I heard a lot of people complaining that the movie should have had more CGI scenes of Terabithia but that would go against the point of the story: it's all about imagination. It's a story about growing up and dealing with things as they come through the use of what kids have available. Narnia could have been that, but instead of showing how the skills and character traits the kids learn in Narnia translate to the real world, it's just shunted aside. The Chronicles of Narnia is still a great series, but BTT is more real, and as a result, far more moving. And more dusty, as a lot of people tend to get something caught in their eye when they watch the movie.