It can be hard to understand what is in a key value field. The below code will loop over the values and spit out the keys and the values.
#if ($UtilMethods.isSet($content.metaData))
<h2>Metadata</h2>
<table class="metadata">
#foreach($key in $content.metaData.entrySet())
#if($key.key != "map")
<tr>
<td>$key.key</td>
<td>$key.value</td>
</tr>
#end
#end
</table>
#end