This is what he has to say about it to a French newspaper:
"The first forty-five minutes are excellent,” Tarantino said of the 3D Western, ”…the next forty-five minutes are a little soporific. It was a bad idea to split the bad guys in two groups; it takes hours to explain and nobody cares. Then comes the train scene—incredible! When I saw it, I kept thinking, ‘What, that’s the film that everybody says is crap? Seriously?’"
I admit, I'm with him on what he said though I think the overuse of the comedy weakens parts of the film more than the villains. When I buy the Blu-Ray, I'll probably make a second opinion!