Official Drupal Themes Don't Cut It
Every Module that I have downloaded so far from the official Drupal.org website has had major issues. The majority of what I have seen has been Browser compatibility issues. If the themes will be listed on the drupal site then shouldn't they be pass some set of standards?
Steve Yelvington has a good article here: http://www.yelvington.com/why-do-drupal-themes-suck
Conclusion: One must take the time to design personalized themes and not rely upon the official repository.
Can anyone suggest a better place to find quality themes?