My 8-year-old daughter checked this book out from the library, and then I read it aloud to her. She loved the book so I'd say it's a hit for the target audience (children). It was a bit of a chore for me to read it since I am not the target audience.
As a forty-something adult, I didn't like the frequent references to Mandy's dad being on a diet. I know it's a reality in life that you'll probably learn about adults being on diets but I felt that it wasn't a necessary element of the story and encourages a negative relationship with food.
The things I did like about the book: there's a woman living in the woods who resembles a witch (but she isn't actually a witch and isn't actually scary), the good kids get to set up a nice Halloween prank to scare the bullying kids, and of course the kitten finds a good home in the end.