I rate all books I finish on there with the following methodology (borrowed from Ken Norton):

• ⭐⭐⭐⭐⭐: The best, you must read this
• ⭐⭐⭐⭐: Good book, you will enjoy it
• ⭐⭐⭐: Average, but I’m glad I read it
• ⭐⭐: Really wish I hadn’t read this
• ⭐: I hated it and probably stopped reading before I finished