Blogs - the quest for quality

Quality of content and relevance to subject - the two most important things that make a good blog, according to Paul Gillin's survey of 297 communications professionals.
That's got me thinking.
What makes a good blog to you, might be a complete turn-off for me. A friendly, informal writing style which informs or poses questions seems to bring people in. That is certainly what I want to see on other blogs and I'm can't be bothered to read those that are mainly composed of links with little other substance. That's a portal, surely.
I welcome debate on this blog and I've already had some great comments and discussion. How would I convert these comments into a campaign, though, or use for research around client/customer viewpoints?
Also, does quality beat quantity? Much of the reading suggests we've not yet solved the conundrum of measuring the feedback received through blogs for effectiveness or engagement. Since research increasingly tells us that blogs are the most popular and influential social media tool, I can see the need to harness them a lot more effectively (and to start using them as a business tool).

References:
http://www.instituteforpr.org/research_single/new_media_new_influencers_and_implications_for_the_public_relations_profess/