*SPOILERS*
First of all, let me warn you. I've always detested Tarantino, so I didnt'go see this film free of prejudice.
That said, I can't think of a worse film I've seen lately, except "The Matrix Reloaded". The reason is that Tarantino shows too much violence, and that he doesn't show anything else. "But that's the point!" some will say. The point of what? Ok, lets' make a film and let's show a rape and say that that's the point. Does that mean that the film is good?
Tarantino has always been overrated (I disliked "Pulp Fiction" as well). The reason is that he manages to feel unconventional and artsy, so many will feel smart by saying that he's a genius, that his films are masterpieces and all that crap. The plain truth is that he's either a sadistic voyeur or a cunning man who's found a way to make pots of money by exploiting people's naivety. Or both.
Although I don't like gore or black humour, I sometimes appreciate it (eg some films with Vincent Price). The point is trivial, but worth making: black humour has to be, well, humorous. The problem with Tarantino is that he's nothing. A vacuum.
Some reviewers have said that if you don't understand what this film is about, you just won't get it; that it's a mockery and so on. The problem is that if one treats himself to shallow, uninspired, unoriginal, uninventive films, who are shot chiefly for the purpose of using some glitzy special effects and for solvin someone's money problems for the rest of his life, you may find such a film creative or inspired, instead of just the trick it is.
Tarantino is in quotations. He quotes all the time. But a film full of quotations and references is a trick that is worth doing once or twice. After that, it can't hide any more the outright lack of creativity that hides behind the references.
If you watch a gory b-movie (or any b-movie, for that matter), you may like it, even love it, but you'd never go so far as to claim it's a work of "art". Tarantino is "hip" (for the time being), so it's fashionable to call this lame director a genius.
But time will tell.
Remember David Lynch.