So you won't be disappointed, this will not be so much a review of the movie Django Unchained as a review of many reviewers. I've read about twenty reviews after seeing the movie. Django is pure Tarantino, over-the-top vulgar and violent, funny at times, the photography excellent and the actors fulfilling their roles well. In short, Django Unchained is a terrific shitkicker.
It is an action-revenge film that takes place in the pre-Civil War South, which along the way grips the viewer with White-on-Black violence and degradation of the worst imagination or fact and Black-on-Black violence (the Mandingo fighting a historical fraud, according to experts) and intra-Black slavery-facilitating discrimination and repression.
Most reviewers and audience polled give the film a high rating at review aggregation website Rotten Tomatoes. They just take it as Tarentino's outrageous brand of entertainment. Probably most viewers knew that going in to the theater.
Some reviewers, Black and White, criticize the ahistorical emphases within the film or the depiction of some Blacks (I don't recall any of these reviews reflecting similarly about the Whites), or wonder whether the film is a useful ideological guide to today's Blacks. They are entitled to their points of view, and their excesses can be forgiven for having to find enough words to fill their column. Still, most manage to lesser or greater extent applaud the film's execution even if disturbed by its supposed meanings.
Instead, don't look for meanings, or imagine them. Just enjoy a pure Tarantino shitkicker, with Shaft melded with Clint Eastwood and upping the gunplay, and every bad guy blown to spectacular smithereens.