I think they say a LOT, but you need to understand a lot of things before you can make sense of it. I used to try to explain some of this stuff here, but it's largely a waste of keystrokes.
If you want to improve your QS, and lower your bids, you need to understand things from google's point of view which they have explained quite clearly, at least so I can understand it. And that point of view isn't just about short term money.
But some people simply aren't going to be able to make this stuff work anymore, at least without starting over from scratch with a completely different approach to their websites, and a different understanding of what valuable websites consist of. If you're stuck thinking that thin affiliate sites are "valuable" to google, or even to the average searcher/clicker you probably can't get out of the box.
There's certainly enough information out there about how to create valuable sites, and to demonstrate value to google. I guess people have a choice. They can continue to be upset because their business approach (which was flawed in the first place) doesn't work anymore, and tweak a little or trick google.
Or, if they want to remain in the game, then the answer is to create content rich, original sites (ie. not affiliate feeds), limit dupe content, and so on. Be reputable, and an expert site.
Google certainly isn't perfect. Almost on a weekly basis they do things that are perplexing. But they aren't THAT perplexing on the QS score, now that it's been around since Summer.