We all know that Google AdWords used quality score as a major factor with ranking ads and with that, they have added features over the years to communicate to advertisers how they can improve their quality score.
Here is an example showing the suggestions on an ad by ad basis, on the quality score for a specific ad:
AdSense publishers are requesting in a WebmasterWorld that Google provide them with specific instructions on how to improve their sites to drive better earnings per pageview and click. Some are asking for Google to communicate if they've been "smartpriced" or not.
Either way, publishers want more transparency on how to improve their sites and earnings using AdSense. Yes, Google does have the AdSense Score Card but it doesn't seem to offer publishers what they want.
One publisher asked for specific advice on how to improve traffic quality, content quality and the user experience directly in a way that earns you more with AdSense. While others just want to know if their sites/pages were smartpriced.
Forum discussion at WebmasterWorld.