I just finished watching Inglourious Basterds, and I have to say, it's a major improvement from Death Proof (which I thought was one of QT's weakest films, by the way, ugh). However, if you walk into the theater expecting an non-stop action/comedy Nazi-killin' fest like the trailer implies, you'll probably be disappointed. I could tell several members of the audience were fidgety during the long dialogue scenes, including myself at certain points. I attribute all that to QT's style, though (same with the random cuts in music, which are pretty jarring).
The ending payoff was amaaazing. The acting was great all around, and I was happy to see Daniel Bruhl on screen again (whee! I have a bit of a crush on him). Christopher Waltz, like everyone's been saying, definitely deserves some recognition for his role. And not to mention any spoilers or anything, but I thought the ending showdown in the projectionist room was spectacular in a Romeo-Juliet type way (emotional, even).
I was expecting buckets of gore like in Kill Bill, but the violence wasn't anything that outrageous. If you can stomach Kill Bill, you can stomach Inglourious Basterds. And go see it if you haven't!! Historical inaccuracy aside, it's worth watching.
PS: Random Mike Myers cameo, wtf? It's a shame the scene with the Brits wasn't more comedic like I was hoping.