When I sailed on the Liberty OTS, I thought the food was fine and we found something goog to eat every time we we wanted a meal or something between meals. You certainly won't go hungry.
Carnival Liberty New Year's Eve 2007
Liberty of the Seas 5/2008+11/2009
Allure 1/16/ 2011
Independence of the Seas 12/29/2013 Top-notch!