If I see a negative, rather problematic, comments, I sometimes delete them and let the author know... A good example would be something like missing attachment...
The problem I have is that it is not so easy to make a connection between the forum user name and the CMS user name...
While I am talking about the commenting system... There is no good way to view the article that somebody has made a comment on... I basically have to open up a new window and search that specific article just to make some sense of certain comments... It'd be nice just to click on an article to open up a new window with the article inside the comment management list... Just a thought...