The problem as I see it is Google has created a bunch of perverse incentives to make your page rank higher. One big problem is Google gives higher rank to "comprehensive" articles. On the one hand that would seem like a good thing right? But what you end up getting is endless affiliate articles that don't seem to be written for humans. And they are really easy to spot if you know what to look for.
A great example is webhosting reviews. Search "best web hosting" and click any of the 1st page results and you will almost always get an article that just rambles on and on and on with headings like: best web hosting for email, best web hosting for blogs, best web hosting for email marketing. To a human, it's an incredibly disorganized mess, but to Google's bots, its "highly comprehensive and authoritative".