mlmblonde, I feel your pain. 2 months ago was my 3rd cruise and first with Carnival. Due to the experience we had it will also be our last cruise with Carnival. As with yours the only great experience we had was our waiter.
So sorry to hear about your experience on the Inspiration. Living in the Tampa area, I've been on the Inspiration six times, most recently March 2010, and have always had great service and a wonderful time.
Did you have the "your time" dining option? I've never selected that myself and have often wondered how that would work for us, especially when we have a large group traveling and dining together. For the hostess to be rude is most certainly unacceptable.
No matter which cruise line or ship we sail on, I always try to give credit to the staff for the number of days and hours they work. It's much more than I could ever do.
Later this month I will have the pleasure of my 10th Carnival cruise, and look forward to many more with them.