Quentin Tarantino had one good acting role, in “From Dusk Till Dawn,” as George Clooney’s pedophile brother. He was pretty good. Good and creepy. But generally speaking—Quentin doesn’t act well.
The man can, however, direct, and when he’s on, he’s electrifying. When he’s off, (and even when he’s on) you can pretty much get the same effect by recording utterances of the “N-word” at, oh, say, a KKK rally—and then cycling that loop for two hours.
Think of 'The Hateful Eight' as the culmination of a body of work magnanimously engineered to liberate the N-word from PC-lockdown.