The ratings now show at the end of each article. Comments are currently for internal use only, but that will change in time. Ratings and comments will be used to rank each article and provide new features in the future.
Ah, I see. I was thinking it would be cool that when you list the articles in their category/sub-category, it'd be useful to have them ordered from the highest rated to the lowest - I might try something like that on my sites in the future.