I just implemented this on my site (although it's in a basic version right now). Essentially as it stands, you can leave feedback for a user in comment form only, and there is a link to the user's feedback from each post. I'm hoping to add more abilities this weekend : positive/negative ratings, and make sure that only people who have traded (it's a barter site) with each user can leave feedback.
You have to do a few things, but it works well.
1. Install the plugin CMS Press and create a "feedback" custom post type. No extra taxonomies needed. Change the Permalink Structure to "%identifier%/%postname%/".
2. Unzip the attached .zip file.
3. Put member_fb_post.php into your /
wp-content/plugins folder and activate it.
4. Put feedback.php into your /themes/classipress/ folder.
5. Put comments-feedback.php into your /themes/classipress/ folder.
Unfortunately, for each user that you already have you will have to manually add a new Feedback post with the title of the user needing feedback. From there, just add a link wherever you want to the get to the feedback.
For example, I the following code to the sidebar-ad.php to add a link:
<li><span><?php _e('View or write feedback for:','cp');?></span>
<a href="<?php echo get_option( 'siteurl' ). "/feedback/" . strtolower(get_the_author_meta('user_login')); ?>"><?php the_author_meta('display_name'); ?></a>
</li>
If i had a user already sign up with the name "example" I'd have to go add a "feedback" post with the postname "example."
Hope this helps someone.
If you want to check it out go to
www.traydz.com/feedback/admin/.