By comparing it to other mediums.
That's the problem. Blogging is a different medium. Blogging is definitely best if it's short in my opinion. The whole point of The Briefing guys stepping into the blogsphere is them trying to contribute to a new medium and culture. Paul's post, I think demonstrates that they still have a lot of listening and learning to do.
IMHO, all Sola Panellists should have to follow and comment on at least six blogs daily, out of both education and courtesy.