I have cruised on this ship. I was sorry to read that Carnival is lax about enforcing the dress code. I experienced this also while sailing with them. In, fact, I think that most ships are getting more casual about dress. With the weight restrictions on luggage with the airlines, it really is harder for passengers to bring additional formal ware on cruises. I don't mind dressing for dinner, myself and always adhere to the dress codes.
I am even more disturbed that they are not enforcing the rules in the adults only areas. When I last cruised on Carnival, they did enforce this rule but that was awhile back.