A good book to me is when I'm completely absorbed into the story. I get this supernova giddiness. I want to keep going, but I don't because it goes to fast. It's a book I know I'll read over and over again. It has to have good characters, story, pacing, and writing. All those are important, but if I don't care about the characters it's hard for me to care about the rest of it or what happens to them.