I'm not sure I understand the point of this. Someone that just wants to blog about whatever can set one up at wordpress, typepad, blogger, etc.
They are no less generic than yours. The only justifiable reason why a group of people would post to one blog is because there is a focus - a coming together or interests. So you have fantastic law blogs (blawgs) such as The Volokh Conspiracy (http://volokh.com/), others in politics, literature, technology, science, and so on. Before you continue to offer your blog up to random others, I suggest you think of the direction in which you would like your blog to go.
They are no less generic than yours. The only justifiable reason why a group of people would post to one blog is because there is a focus - a coming together or interests. So you have fantastic law blogs (blawgs) such as The Volokh Conspiracy (http://volokh.com/), others in politics, literature, technology, science, and so on. Before you continue to offer your blog up to random others, I suggest you think of the direction in which you would like your blog to go.