You can offer your users to rate posts and pages in your WordPress site. WP-PostRatings plugins provides you an easy AJAX rating system with all useful features and management options.
Start by installing it your website. Upon activation visit your admin area dashboard Ratings -> Rating Options and select a rating design you like using in your website.
Select the the maximum number of ratings to show, you can also enable Google Rich Snippets that shows up in search engine results page. Choose other optional settings and save your changes.
All post ratings can be managed from Ratings -> Manage Ratings admin screen.
The plugin also provides you easy uninstallation too. For installing it from your website, visit your admin area dashboard Ratings -> Uninstall WP-PostRatings page, scroll down, tick yes and click ‘Uninstall WP-PostRatings’ button.