I'm going to do what I can to elaborate without spoilers.

The cast was great, the dialogue was great, but there was a void throughout. I felt that the extended character development was a little misguided. There were several unanswered questions why popped up and were given no explanation or closure. He made a "good" movie and you can't take anything away from his originality but in my opinion this movie needed a spark that wasn't there. He gave his own twist on a historical event but it felt less than brilliant. There were several -isms that drew comparisons to his previous movies but they had something this one didn't. If Tarantino retired after this I don't think I would blame him. After all creativity and originality and Hollywood are starting to be the opposite of synonymous given how many remakes and sequels are coming out. Improve on the old is the trend and I don't feel there is enough creative competition to result in another theatrical masterpiece.