This book is recommended if you want a (very) quick read which will make you think after reading.
To me rating a story like this is quite difficult, as I have just finished reading it. It’s even difficult to call it a story as this is more a situation created by the author. Even though what happens in Omelas doesn’t make sense in reality, something true is hidden between the lines. It rises the question: Are we in Omelas? Are we the child? Or maybe we are the ones who walked away from it?
I might update this if I have drawn my own conclusion, but I don’t think there’s a right answer to these questions.