I mentioned last week that I added a "rate this post" feature to my blog using the Drupal fivestar module.
There is a serious usability issue with this module. If you don't show the rating widget on the article teaser then visitors probably won't know there is a rating feature, and so there may not be a lot of rating activity. (The teaser is the first few paragraphs of the entry, displayed on the blog page.)
Comments work similarly to ratings. You have to click through to the full article to leave a comment, just as you do a rating. This, however, doesn't present the same problem as article ratings. First, visitors tend to know that if a blog supports comments, you have to click through to the full article to access the comments. Article ratings aren't a common feature, so visitors don't expect them.











