I will get to 12 YEARS A SLAVE sometime soon. I did finally get around to watching DJANGO UNCHAINED, and the aspects of slavery depicted in that were (I know it's odd to say this, but): refreshingly horrifying. I put it that way because I'm both repelled and drawn to learning more about what the HELL it was all about.
(I believe that at least one thing in DJANGO (the "Mandingo fighting") has been stated as not true to history. But it certainly seems to fit in with other aspects of the treatment of slaves, so I take it, as always with Tarantino's flicks, as a kind of poetic license. I have to admit to being a sucker for his films as occasional entertainment, however faithful to original material or history they may or may not be.)