Was there even one director on Lion King?
Stanton is a bit more of a storyteller and is also a writer. You look at Stanton's resume (Assuming you like PIXAR) and he simply does not have a stinker as a director or writer. If this stinks, he should never leaves the dungeons of PIXAR again. I'm not talking box office since that can fail a movie many times, I'm talking about making a horrible movie. More than I like the book, I believe this guy will tell a great story of the book regardless of the marketing.
So I do expect bigger things from him than I do the director of Lion King because Lion King was a complete team effort. No one person, except maybe Katzenberg, can claim credit for it's perfection.