The New York Times has a lengthy review that includes this: "His provocative rereading of history is overshadowed by a plot that manages to be both cumbersome and flimsy." The Guardian calls it "hard to hate but tough to love".
Roger Ebert's site opens with this:
Quentin Tarantino's ultraviolent, ultra-talky sorta-Western "The Hateful Eight" is an impressive display of film craft and a profoundly ugly movie—so gleeful in its violence and so nihilistic in its world view that it feels as though the director is daring his detractors to see it as a confirmation of their worst fears about his art.Empire Online says, "On a par with Inglourious Basterds and Django Unchained, The Hateful Eight starts low-key but ultimately delivers big, bold, blood-soaked rewards. Roll on, QT Western number three." Rotten Tomatoes has an audience rating of 76%.