Earlier quoted context omitted.
Oh come on! I am no fan of Google and their privacy policies etc., and I agree that results like the sites mentioned in this thread are annoying but I am not so cocky as to think I have any idea what Google is fighting. There are a lot of very smart people from all over the world putting everything they have into getting to the top of that site. It's not a trivial task for them.
I disagree. Google has absolutely dropped the ball - I'm not saying that it's easy to algorithmically rank good/bad content, but they're not even trying. A stop-gap solution would be to simply penalize anything with ads. Legitimate websites will still have enough "SEO juice" (for the lack of a better term) to offset the penalty, but brand new copycats with otherwise no inbound links to them from other legitimate webs…
And when you get to that state, you've pretty much turned the entire web into content marketing for your ad sales business.
So - of course search quality suffers. Search quality is not the point.