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in the file templates/xdir_link.html on line# 20 delete this line: which spans line 20-21
<a href="<{$xoops_url}>/modules/xdirectory/ratelink.php?cid=<{$link.cid}>&lid=<{$link.id}>"><b><{$lang_rating}></b><{$link.rating}> (<{$link.votes}>)</a>
<br /><br />
This will delete the display of the ratings.
Did you want to remove the link to "popular" and "Top Rated" in the main menu also?