"It’s Time for (Many) Experienced Writers to Stop Blogging" (by L.L. Barkat via Jane Friedman) makes the argument against blogging.
"3 Reasons for Writers to Have a Blog . . . and 3 Reasons Not To" (by Ali Luke and Joe Williams via Joanna Penn) is a balanced article that explores the pros (such as the blogging community) and the cons (such as the difficulty in promoting fiction).
“Being an author in 2013 is like being a small business owner,” Fauzia Burke says. In "5 Reasons Authors Should Blog," she explains why an author blog is important.
"8 Things Every Blogging Writer Should Know" contains concrete, practical details (by writer/blogger Chris Higgins via Chuck Sambuchino).
"Here’s Why Your Blog Sucks (8 Reasons With 8 Fixes)" is a helpful article for bloggers in general (not authors specifically) by Brooke Ballard via Martina McGowan about what's wrong with many blogs and what you can do to fix them.
I read lots of blogs in my own quest to be better. And, lemme tell ya, a lot of blogs SUCK!" says Brooke Ballard.