Basically because it looks like Grindhouse Goes to Europe, which is really dismaying. All splatter and camp and nothing else. I liked Death Proof and all, but since Tarantino movies don't come along all that often, it left me wanting more. As for Basterds, obviously this is just a very early trailer, and more substance probably lurks beneath the lurching metal n' blood surface, but for right now I'm decidedly less than thrilled. Remember that glimmer of deeper meaning at the end of Kill Bill Vol. 2? I was kind of hoping for something like that.
Looks like instead we'll get a weird Hitler joke, Brad Pitt doing what Brad Pitt does marginally well, and that smug BJ Novak looking smug. I'd ask someone to wipe that look off his face, but I think it'd require the actual removal of his entire face.
Watch above and judge for yourselves.