I think she'll be a decent president, but because of the image Republicans have crafted of her (with Hillary's help, of course), people will overreact or judge her more harshly for things largely out of her control, or highly misconstrued.
Also, these polls should have the same options, but separated by party. I'm willing to bet a lot, but not all! of the more positive results were from Democrats/liberals, and a lot of the negatives from Republicans/conservatives.
Perhaps I could have done that. I put out an identical poll for Trump. So far feelings toward Trump are a lot more negative and polarized (fewer "optimistic" and more "scared").