What are disadvantages of Drupal?Report
The disadvantage of Drupal are:
Drupal is not user friendly interface. It requires advanced knowledge and few basic things about the platform to install and modify.
Drupal is new content management system. It is not compatible with other software.
Performance is low compared to other CMS's. The website which is built using Drupal will generate big server loads and never opens with a slow internet connectons.