When I realized how well Google ranked Blogs running WordPress with very little optimization in 2006, I was amazed and also surprised. Yes, there were some great blogs, but this way of ranking also jazzed up not so great blogs, including my own.
In 2015, or rather since July 1st, 2013 this has changed, as Marco Arment points out:
→ Marco.org | Google and blogs: “Shit.”