I never had a bad experience on Celebrity or any other cruiseline. But I will never take any abuse from a waiter or any other member of the crew.
I have also never worried about anything of value left in the cabin.
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 Booked!