[zafiro17]

Prioritizing new content is going to exacerbate a lot of already existing problems with the WWW. I won't echo the already good list of reasons why old content is relevant. But I will point out it will usher in a new era of re-showing you old content that has been repurposed "as new" via minor edits. And it's going to also help convince a growing audience of web surfers that only the latest/greatest is worth knowing about. That in turn puts additional pressure on content producers to obsess endlessly over SEO tricks and gimmicks. In sum, this worsens the user's experience by prioritizing things that benefit Google. And this, of course, should be no surprise to anybody who has watched Google's business decisions over the past 4 or 5 years.

[stebann]

Yes, exactly that. Also Google doesn't take actions when you report something or they just dismissed the reports: spam-blogging, spam results when you're looking for references, badly translated news sites copying content from legitimate sources, and the list goes on.