My 2 cents is that blogs made it really simple for the MFA and thin affiliate rubbish sites that Panda was going after. In my opinion, blogs created a whole "spam" issue. Try finding me a non blog website that isn't made up of 75% ads, about 3 sentences of information. So yes, the mighty blog made it easier for the lazy folks to scrape, exploit, monetize in a mass volume. Of course not all blogs fit this category, but again, you won't find me a non blog that is that 75% to 85% ads and 2 sentences on anything OTHER THAN A BLOG.
So Google really should add extra scrutiny to blogs. Websites made too easy is a recipe for spam. Yes they helped create the monster.
edit: I should also add that we all know Google banned an entire domain extension from their index also. Sure they weren't ALL bad websites, but did that matter to Google? No. They all got torched. Blogs = spam in Google's mind? Be afraid, be very afraid.