I agree that giving this feedback to Google is not going to make any immediate difference for your site. As with spam reports, they will use the feedback in an effort to imporve the algo, not to make a one-off manual change.
Things to remember - no one wants to be told their baby is ugly. No one likes to lose income. And so complaints are going to predominate quite heavily, and they certainly have.
At the same time, there ARE reports of recovery. There are webmasters who had no trouble spotting their shallow content, once they've been hit. DemandMedia was willing to say "mea culpa".
At this point, the most common theme I see in wrongly Pandalyzed sites is that their original content is too widely syndicated and sometimes scraped. The signals that Google uses to identify the canonical source of the content are being swamped, and the result is that the original source starts to look like a scraper.
Advice from the Pubcon keynote if you find your site in this position - use pubsubhubbub to serve Google "fat pings" the instant you publish new content. This will give them a strong signal that you are the original author.