Of course, few things involving food are without controversy. Here are but two examples. See this report on a battle between animal rights activists and a Sonoma CA duck farm that produces foie gras. And this news article on how a Smithsonian history of foie gras event was canceled due to pressure.
Here's a link to the Humane Society of the USA's page which takes the position that force feeding ducks and geese is is cruel and should be stopped.
The counter argument is to "Foie Gras FAQ: the liver everyone loves."
Both sites contain more links supporting their view of this controversy.