Most blogs that have quality content are actually promoted and have real personality plus they superserve the audience. The rest are splogs that just gamble on getting some SE traffic. Surfers can smell the difference.
Take Rochard's blog vs most others for instance. It looks fucking good and he doesn't just add random pics.
http://www.rochardsbunnyranch.com/blog/
There's a few others but it's late and I can't think straight right now.