This should be an interesting case.
They say you're only as good as your last movie, and John Lasseter is now coming off of Cars, which sharply divided many of his fans. While he's the pioneer who built Pixar's reputation, there's more respect for Brad Bird and Andrew Stanton (as well as a few non-Pixar filmmakers.) Also, since Pixar officially became part of Disney, Lasseter's new duties have taken him away from the director's chair. Who knows when we'll see something new from him.
But I feel that you shouldn't write off Lasseter just yet. After all, this is the guy who directed Toy Story 1 & 2 and who has an amazing ability to bring humanity to inanimate objects in short films like Luxo Jr. and Red's Dream. He taps into the simple beauty that exists all around and presents it in a way that can make you appreciate landscapes with new eyes. (I bring your attention to the automotive nature of the land surrounding Radiator Springs, the mushroom-lit ant colony and the endless details found within Andy's room.) His films may be less sophisticated than Bird or Miyazaki, but for directorial artistry he's very much their equal.