A few months ago, I participated in a study to rate the quality of 10 different blog post writers. I assigned a rather difficult topic to these writers and rated the anonymous results from 1-10.
The top three posts were very close.
Extremely well-written, well-researched, and interesting. As it turned out, two of the top three posts were written by a computer. Yes. Automated writing!
The bottom two posts were also easy to choose. Almost un-readable. Both of those were written by humans.