Why books are better than movies

The movie "Percy Jackson and the Lightning Thief" had been shown during January. It's starred by Logan Lerman, about a young guy about 15 or 16 years old, he gets adventures and his life threatened by greek mythological beings.

But is he really that old in the real story of the book "Percy Jackson and the Olympians: The Lightning Thief"? NO,it's not. The book tells about a 12 year-old
boy, who is also threatened by greek monsters. The big difference of the book and the movie is that it's not only the "lightning bolt" of zeus that was stolen but also the "helm of darkness" of hades. Yet some of the changes were good, the original was really the best story line.

Also because of the changes that they made, it would most likely lessen the chances of making a sequel for the next book which is entitled "Sea of Monsters"