The worst are the Department Of Justice...

According to Sheikh Mohammed himself,

"The following departments rated highest in terms of employee satisfaction: Dubai Technology and Media Free Zone, Dubai Airport Authority and Dubai Electricity and Water Authority. The worst are the Department of Justice, Dubai Development Board and Dubai Ship Docking Yard (Al Jadaf)."

This is part of his speech at the Dubai Government Excellence Programme Awards ceremony on April 19th 2005. You can read it here.