Old, unsupported, BUT the best one out there!

Simply uses the comment_karma field to link the rating to the post.

On a completely custom comment page simply use :

comment_form( );

Than parse all comments, e.g.:

$comments = get_comments( );
foreach ($comments as $key => $comment) {
echo $comment->comment_author . ”;
echo $comment->comment_karma . ”;
echo $comment->comment_content . ”;
}

Perfection!