Its no secret that Google is often in breach of its own TOS, with no content above the fold etc. made for adsense pages( how about whole niches made for Adsnse G?) but $#%@# does almost every download site these days has to have a giant DOWNLOAD BUTTON that is actually an ad while your real download button is barely noticeable. This after a dozen years of TOS?.....evil robot....grumble
They have been allowing the download ads for years, so I don't expect that to change anytime soon. However they do act on other types of issues, and it probably can't hurt to make your voice known. I'd do it as a user and not a publisher though; they care more about users.
I have to agree about some of those ads that are clearly deceptive. As netmeg says, it's an AdWords issue, not AdSense. The problem where I see the publisher getting into hot water is the placement of the ads on the page. Some are right next to the real download button, which takes less prominence.
I saw one huge green download button ad via AdSense the other day and couldn't believe that would be a good user experience. It was on an old and popular site for downloads that many programs use to manage distribution of freeware, cnet. I'm sure the distance between the actual download button I wanted and the much larger Ad "button" was the exact policy requirement and not a pixel more.