If you have a popular blog then you may get a lot of comments. It is possible to have a blog that is popular and still get very few comments, and that is not a bad thing as most pleased readers will simply leave the site and await next weeks post. If you are getting a lot of comments then it may mean that people are unhappy or concerned about your topics. It may even be that they enjoy going onto your blog so that they may cause trouble. If you are getting a lot of negative comments then you can embrace them, as it is a form of publicity. If you are not too happy about them then consider the content of your blog posts and how they may be affecting your commenters.