Long ago I have moved to Drupal from WordPress due to its lack of features. But the 2.5x series of wordpress is so cool that I could not but re-migrate to wordpress from Drupal.
The main drawback I faced while using Drupal is speed. Drupal used to load too slowly. Again, I found current features of wordpress enough for me. So, after more than 3 days of effort, I could migrate to WordPress.
There are still many things that I need to update yet. Wish to do very soon.