Why is the quality of the featured images in category grid view so bad on DW Argo?

Hi Manuel,

To resolve this issue, you need to set the thumbnail size to 250x250px, please see our guide here for more details: http://cmspioneer.com/designwall/guide/dw-argo/#featured_images
About the post thumbnails in Metro content, you can follow the steps here to force crop for featured image:
1) Open up the functions.php file in themes/dw-argo folder, and add the code below to the bottom of the file:

// crop thumbnail in metro area
if ( function_exists( 'add_image_size' ) ) { 
 add_image_size( 'metro-thumb', 500, 500, true ); //(cropped)
}

2) Open up the feature-metro-layout.php file in themes/dw-argo folder, find the code below (around line 51):

<?php the_post_thumbnail(array($thumbnail_size, $thumbnail_size)); ?>

.. and change it into this:

<?php the_post_thumbnail('metro-thumb'); ?>

P/S.: You’ll need to re-upload the post images so that WordPress can recreate the thumbnails for you.
Hope this helps!