I knew very little about the film before seeing it, beyond the facts that Django was a black slave and that there was controversy enough to pull toys from shelves...before they even got to the shelves.
I think the real controversy was that Tarantino was remarkably honest with his portrayals.
The first indication of such was the moment Schultz shot the horse. Too few horses get targeted in westerns, let alone any genre of film. How many Indians have chased stagecoaches for miles on end when they could simply have shot one horse instead?
Another case in point was the moment Django decided to let the slave be torn apart by dogs. A human reaction, rather than a typically heroic one, to a hopeless situation in which all he really cared about was rescuing his wife.
Typical Tarantino elements blend seamlessly with the honest realities. Faded, worn out Grindhouse flashbacks; unusual music choices; spurting blood; humour and irony. And naturally the spaghetti western styles and music that have influenced him before.
Where is the controversy? The amoral revenge? What else could he do but destroy Candyland? It always bugs me in westerns when an enemy is allowed to live, because they always come back with murderous intent.
Django Unchained has the spaghetti western sensibilities that set the genre apart from most Hollywood westerns of the '60s and early '70s.