First of all, this is the opinion of a guy who thought Deathproof was a masterpiece, and who loved Inglourious Basterds enough to see it three times in the theater. After putting my brain into the land of internet opinion, I have come to realize that I am sort of a minority in this respect.
That said, I was slightly disappointed with Django Unchained. Really I think that it would have been perfect for what it was if they had ended the movie at the first final shootout. Why go through the unnecessary and predictable jaunt of having the second capture, imprisonment, escape and gunfight, when it was already clear how everything was going to finish. My thought is this, either end the movie with a grand finale at the initial opportunity, or take the movie in an unpredictable direction and keep things interesting.
In all, it's a minor complaint. Compared to a movie like White Chicks 2 (which I don't think even exists), this film is obviously a classic. Judged on that honorable merit it gets a solid 4/5 from me.