Reading some comments, speaking to those who saw the film seems to emerge clear the rift between those who loved the film and those who, instead, called it boring and without biting.

Seems like I am in the first group:) I loved it. But when it comes to Tarantino's movies, I think there is always a rift between those who love and those who hate them. I wrote about it a few months ago:

You love Tarantino’s films or not – there is no such thing in between.
I love his movies. He knows how to surprise you -with blunt violence, or in case of this one, lack of violence, at least till the end. Even then, not in a way you might expect either.