If you want to remove the "Reviews" tab from the widget than follow my instructions it's very simple!
Find the following file:
IMPORTANT!!! MAKE A BACKUP FROM THIS FILE!!!
Now open the file in a text editor (i recommend you Notepad++)
Delete line 42:
<li><a href="#"><?php _e('Reviews','gamepress'); ?></a></li>
Then delete everything between line 46 and line 74 including line 46 and 74
<ul id="tabs-1" class="reviews pane">
Save the file and upload it to your site.
Here is my Site: http://www.myclan.hu