The New Yorker calls it a "crap masterpiece". The NYT says it's "crazily entertaining, brazenly irresponsible and also ethically serious in a way that is entirely consistent with its playfulness."
EW has a B- review. Rolling Stone says, "Welcome to alternative History 101 with Professor Quentin Tarantino" and closes with this: "Wake up, people. Tarantino lives to cross the line. Is Django Unchained too much? Damn straight. It wouldn't be Tarantino otherwise."
Empire Online gives it a good review and says, "Django Unchained isn’t a Western. Tarantino himself has said, if anything, it should be tagged a ‘Southern’" and concludes:
Another strong, sparky and bloody entry in the QT canon. Although, creaking under its running time, its not quite as uproariously entertaining as his last pseudo-historical adventure, Inglourious Basterds.Roger Ebert gave it a full 4 stars and calls Tarantino "a consummate filmmaker." Rotten Tomatoes has a critics rating of 88%.