If a site is private then you can turn on article ratings.
Edit site settings
Navigate to the site settings page.
Enable article ratings
- Check the Enable article ratings checkbox
- Click Update

Updated Jun 30, 2018
If a site is private then you can turn on article ratings.
Navigate to the site settings page.
@Nicole - no, there is not.
Will article ratings be made available for public sites?
@Andy - Doing so is not currently on our internal road map.
+1 for public sites. It would also be good if the rater can be given the opportunity to enter a reason if they give a thumbs down. Otherwise we have no idea what needs to be done to fix/improve the article.
Is there any dashboard or consolidated view of article ratings available?