Is this new? In my AdSense interface, I see something I've never seen before, a "scorecard" (see image below)
Apparently I'm getting a lesser score because of the text/image thing, but I'm rotating them myself and not having Google do it, so that's why that score is so low.
Not sure why the site health only has four dings; when you expand it all it lists is page speed, and it says I'm nice and speedy. My only crawler error is blocking G from my search results page.
Interesting. Doesn't really tell me anything I don't know, though.