The OSInet team recently attended Solutions Linux, a trade fair focused on FLOSS, and while chatting with a sales engineer from a company specialized in Typo3, got asked which CMS we used, and of course answered "Drupal".

At that point, that person flinched somehow, acknowledging that Drupal was indeed one of the "Big 3" in the CMS space, along with Typo3 and Joomla, but was plagued with security issues making it rather unfit for professional deployment, as opposed to Typo3, which took security issues seriously. Continuing the discussion, it appeared that company has indeed at least acquired some Drupal knowhow too, due to customer request, but the person doing the criticizing was not directly familiar with Drupal.