What is the general feeling from the community. Is this a good idea or not?

While we believe it is important to communicate with our community as much as possible and we of course also believe in providing good customer service to our users, we would like users to be able to post comments on blog posts but are a bit concerned that it could turn into a bit of a stage for users to gripe about issues they may have with the site (there are of course other channels for them to do this).

Do you think this is a valid concern?