We were first time cruisers on Princess. This was our 14th cruise, with about 9 on Royal Caribbean. I notice that first-timers on a cruise line tend to be more critical than others, I hope I am not.
CONS: Most of the negatives I have can really be attributed to most ships on any given cruise. The first was the terrible service we received on our second night in the dining room. We were a table of eight and went to our table at about 6:15 ("Anytime" or whatever they call it Dining). Our service was very slow. By 8 PM we were finished with our meals. Our plates were not picked up by 8:25. Finally all of us just got up and left without ever seeing the dessert menu. One in our group did complain to the dining room captain. This may have lead to the PRO comment to follow.
Our cabin attendant was slow to prepare our room the first day and was not there until about 3 PM even though we were out of the cabin all day.