I liked Kill Bill Vol 1 (haven't seen 2 yet, no babysitter lol). But they were a MAJOR departure from his earlier work in my opinion.
Like Nuke mentions, the dialogue is retarded in KB, whereas it was really the strength of his other movies (and don't forget True Romance, written by QT, directed by Tony Scott who screwed up the ending). In some ways I think that this 5th grade dialogue was intentional, as if QT were trying to show the audience that he was capable of doing something different. I have a friend who works in Hollywood, who used to love QT, but stopped caring when he realized that "all he does is write like Elmoore Leonard" (who wrote the book "Rum Punch" which Jackie Brown was based on). I imagine that this was a typical criticism that he is/was attempting to get away from.
His next project is tittled "Inglorious Bastards" and sounds a lot like "the dirty dozen." It's a WWII film where convicts sentenced to death are given a high risk mission to save their necks. I haven't heard if it would be Pacific theater, but that would make sense if he's trying to get a little difference from the dirty dozen.
Anyhow once I got past the fact that there wasn't going to be kick bellybutton dialogue in Kill Bill, I was able to settle down and enjoy it.
-Sik