There is a difference between real writing and 'Internet articles', that's for sure. I find that it is increasingly difficult to find quality material online and I think that's one of the reasons for this latest change by Google. Most of us are sick of finding garbage when we do a search for real information.
Professional writing is that which is done for money, to earn a living. Unfortunately, professional writing has lost its perceived value on the Internet because of the nature and novelty of this new form of communication. It's as if everyone were suddenly given a plumbing kit and the plumbers are put out of business. It isn't long though before drains are clogged and there is backup in the septic tank. That's pretty much what has happened with skills like writing and photography. Eventually, it will correct itself but it will take a while yet.
The writing on farm sites is not professional and relies on people who enjoy writing on an amateur basis but may be at many different levels of ability. This is where you see keywords and page views becoming more valuable because that is where the dollars lie for the owners of farm sites.
On the plus side, amateur writers can hone their skills and get feedback on their work. There is a sense of community and owners of these sites can make a very good living.
A less desirable aspect is that information becomes Wiki-like and not at all reliable. Professional writing is not part of the Internet at this level because everyone has a 'plumbing kit' and is busy doing it themselves.
Don't worry. It will change. Google has already started clearing some of the drains :)