Here is how I rate my books.
One star: It was hard to keep reading, but parts were interesting so I kept turning the pages.
Two stars: Enjoyed it, but that’s about it.
Three stars: Enjoyed it, possibility of mentioning it to other readers, might add it to my collection if I found it at a used book store.
Four stars: Loved it and would possibly recommend it to anyone and everyone, quite possibly might add it to my book collection.
Five stars: Adored it, buying it, considering re-reading it in the future and recommending it to anyone that breathes.