The Poesia is a beautiful, pleasant ship. Our experience was far better than many negative reviews have described.
There are unusual features such as performances by real, Italian opera singers. The buffet is filled with Italian foods such as antipasti, various pasta dishes, and a salad bar with olives, artichoke hearts, and sun-dried tomatoes. The dining room fare is much like Carnival's, with an Italian focus. It's good food with pleasant wait staff who are mostly Indonesian.
Notably, we experienced no outright rude episodes from staff in the public areas, as has occurred on too many other cruises on "leading" cruise lines.
There are ZERO sales pitches over the public address system--a very welcome departure from the frequent interruptions so common on Carnival and NCL.
If, in order to be satisfied, you need a hairy chest contest, an Electric Slide session on Dec 9, hot dogs and hamburgers at lunch, or a Jean Ann Ryan musical show, then the Poesia is not for you. If you are not desirous of a vacation among many European families, then find another ship. If you want cigar smokers like me to be scorned and banished to Deck 14 aft, then you'll be unhappy with the presence of the gorgeous, large cigar lounge.
If you want to take a cruise with classical performing artists, freedom from haranguing bar servers, and the company of many nice Europeans and French Canadians, I recommend a voyage on the Poesia.