If you've seen the previews, I don't think anything I'm writing here is a spoiler, but if you're sensitive about such things, don't read this post.
I saw it this weekend and quite liked it. Didn't love it. Didn't think it was awesome. But I really really liked it. The slow suspenseful music-less moments (the first scene and the scene at the basement bar) are, for my money, the best parts of the film and show what a master of film language Tarantino is. I was grateful, after Kill Bill's mannered deployment of the "Quentin Tarantino Explains the Dual Meanings of Pop Culture Signifiers" monologue every fifteen minutes to have a period piece that forced him out of it. I was also happy that he shot a film in three languages, which forced him to work in somewhat different dialogue styles. I was finding his writing a bit pat by the end of KB2, so it was nice to see that he can break out of that when he wants to.
To me, what's most interesting about QT's post-Pulp Fiction work is the weird subtextual airing of conflicts and ambiguities about his own films, filmmaking and his audience. He followed Pulp Fiction up with Jackie Brown, a purported heist thriller/comedy that is pointedly, deliberately unthrilling and character-based (not that that's a bad thing) and then follows that up with a two-part meditation on violence which is really a meditation on violence-as-entertainment, much of which is filled with decidedly unentertaining, excruciating to watch and listen to sequences.
And now we have Inglurious Basterds, QT's answer (if interviews are to be believed) to There Will Be Blood in which the climactic sequence is a bunch of Nazis laughing at a film showing a massacre of American Soldiers, followed by a laugh-out-loud funny massacre of the same Nazis in a movie theater where the central image is a burning movie screen. QT shows Hitler laughing and cheering the slaughter, and then gives us a slaughter programmed to make us laugh and cheer. It's kind of breathtaking, really. Roland Barthes would've had a field day with this movie.