When rating a book on Goodreads, what is your rating system?

[Barbara, Founder and Moderator]

I know that they have 1 to 5 stars but what is your personal way to rate a book? What qualify's to you for it to be "amazing" etc.?

[Tui]

To get my five stars, it has to cast a spell over me that lasts for days and the memory of it remain with me forever. That is far more important to me than being technically faultless.