First, I completely disagree with both your opinions. Secondly, the dude's previous film was his biggest commercial hit, was a critical success and was a constant presence in awards ceremonies and whatnot. You may not like his movies personally, but the world still embraces Tarantino movies and still looks forward to them.
Disagree all you'd like about Wilder (though by my count he's got at least a dozen all-time greats; I haven't seen his whole filmography), Tarantino is an indisputable wang.
That said, I actually don't mind his movies -- especially his 90s output -- and believe that he's a talented filmmaker. Death Proof and Inglourious Basterds are my least favourite among his work, but I wouldn't say either are genuinely bad
films. Then again, I wouldn't say Fedora or Buddy Buddy (from what I remember, it's been a while) are genuinely bad
films either. Not by today's standards anyway. Clunky, tired, not nearly so exciting and inventive as their makers' earlier work. Sure Inglourious Basterds was a commercial and critical success where Wilder's last few flopped, you've got me there. But let us not equate popular opinion with quality. See The Master for an easy refutation. Or, conversely, The King's Speech.
I'm looking forward to Django Unchained and sincerely hope that it does something different, but I get the feeling it's gonna be exactly what I think it's gonna be, exactly what you think it's gonna be, exactly what everyone who's seen his previous films thinks it's gonna be. This is what I mean when I say he's entered his Buddy Buddy mode. Not just predictability, but predictability bordering on irrelevance. You hardly have to see the movie to have seen the movie. I don't think there's any way that future generations will look back on Basterds or Deathproof with the same affection and devotion that they will Pulp Fiction and Jackie Brown.