Here, I'm NOT talking about core to core comparison. I'm only interested down to earth, practical world comparison. For that, when I talk about wordpress, i talk about wordpress + wp plugins. So wordpress = worpress + plugins.
so compare drupal to wordpress + plugins.
If a WP plug in takes care of the missing core functionality to whatever the drupal engine does out of the box, I do not accept it as a lack of capability on WP's part. I'm only interested in "at the end of the day picture". If I can address that missing functionality in WP -using some plug ins-, it is as good as to me as if it was available within WP out of the box.
In order to answer this question, you should also be an expert in drupal.