What do *you* think makes a book a good book or a well-written book?

In my opinion a well-written book is when the main character goes through some sort of a hard time. It just when he/or she seems like there making a heart-breaking experience they end up in square one again. To me it isn't the amount of drama or action that matters in a book (even though I find that necessary in a book), but how the character goes through the situation. How your life can change in just an instant that you never expect.