woocommerce/templates/loop/rating.php

<?php
/**
 * Loop Rating
 *
 * This template can be overridden by copying it to yourtheme/woocommerce/loop/rating.php
 *
 * HOWEVER, on occasion WooCommerce will need to update template files and you (the theme developer)
 * will need to copy the new files to your theme to maintain compatibility. We try to do this
 * as little as possible, but it does happen. When this occurs the version of the template file will
 * be bumped and the readme will list any important changes.
 *
 * @see 	    http://docs.woothemes.com/document/template-structure/
 * @author 		WooThemes
 * @package 	WooCommerce/Templates
 * @version     2.0.0
 */

if ( ! defined( 'ABSPATH' ) ) {
	exit; // Exit if accessed directly
}

global $product;

if ( get_option( 'woocommerce_enable_review_rating' ) === 'no' )
	return;
?>

<?php if ( $rating_html = $product->get_rating_html() ) : ?>
	<?php echo $rating_html; ?>
<?php endif; ?>