I'm not sure how I feel about Quentin Tarantino. I'm not an unqualified fan. Don't get me wrong. He is a tremendously talented film director and I've seen most of his movies, but his films often times reduce characters to cartoon figures and fetishize violence. Jackie Brown was not in that mold. It had likeable main characters, tight narrative and a great story.
What I liked about Once Upon...:
-I was never a fan of Kung Fu movies, but did like The Green Hornet, so I loved the scene and story involving Bruce Lee.
-Although it is fiction, it nonetheless humanized a whole lot of people we knew from the news of the time. Tarantino handled that-both of the scoundrels and the innocents with a daft touch.
-In a matter of speaking, he lead me down a dark alley to the end and mugged me. I like that in a director and IMHO, no one does that better than Guy Ritchie.