List of things that Coca Cola is useful for. Better for cleaning than drinking basically; a cheap source of phosphoric acid. The company's view is here including the point that coke can be part of a healthy diet. At ten spoonfuls of sugar per can, I kind of doubt it (read Save Harry).
As a corporation, it's accused of some dirty practices. Read Killer Coke for it's troubles in Columbia or Toxic Cola in India. To be fair, here's a response from Coca Cola.