He does deconstruct cinema in his films, yes (the film reels in IB were seriously explosive IRL), but I'm always questioning to what end he's doing this, and I never get anything other than 'because he can'. I'm sure I could, too, if I'd seen as many movies as QT. I don't know - I guess it depends on whether or not you think sending up Hollywood in and of itself is worth much. I guess it's kind of cool, but I think if he really tried anymore, he could do just that. Something like Pulp Fiction is good, but it's really a series of great realist vignettes jumbled up. That doesn't scream ultra-'post-modern' to me, personally..
He does get it right in Jackie Brown, which is ostensibly a blaxploitation flick, but instead it's got the best characters he's committed to screen - probably because the film has characters that don't all sound like QT (which might have something to do with the film's novel roots). That's where he really turned it something on its ear and gave people something not quite like what they expected. The problem with JB was that the term 'blaxploitation' didn't mean a lot at the time. If he'd put it out within a few years of Foxy Brown (which, obviously, would have been difficult), maybe he would have had something. IMO, that film did poorly because what he was aping had been gone for a long time (Vampire in Brooklyn doesn't count!). I guess whether you value that as something 'post-modern' depends on whether you prefer character pieces or the method of delivery (non-linearity, etc.)..
QT has said that not showing the heist was 'initially' due to budget restraints; nonlinearity is obviously something that a lot of films did before RD/PF, and QT, no doubt, will have seen those films. I dunno.. I mean, I like his films, and I'm being super reductive here.. I've not liked his films post-Jackie Brown and I think that's what pisses me off mainly - he basically jumped the shark with Kill Bill. He's got his public mindshare and a nice little niche with Harvey Weinstein, he can basically direct what he wants.
tl;dr: he can but he doesn't.
It's interesting to see how opinions differ, anyways.. I've not seen The Artist, but what I've read seems to indicate it's trying to do what QT does in Jackie Brown. I'll have to watch it one of these days.
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That took way too long to write for what it is... A team has signed a player in the time, surely?
EDIT: I took Portsmouth out with that. Damn.