We don't do the shows and don't drink so we can't comment on the entertainment. We also did not book any shore excursions, but enjoyed the 3 ports we visited. We hadn't cruised in 5 years.
Our goal was to relax, and even though the boat was busy with the holiday and lots of kids, we were never put out. We only used the formal dining room once, ate at 2 of the specialty restaurants and at Taste several times. Rest of the time we ate at the Buffet. We were pleased with the quality of food and presentation. Never ended up waiting for a table, always were seated immediately.
General cleanliness of the ship was spotless. There were lots of hand sanitizer stations (something missing on our following cruise on Carnival). One thing all cruise lines could do better is mark the non smoking sections better. Use decals on the outside deck walls. Inside the ship the only smoky section was one part of the casino. But several times there were smokers on the jogging track.
Don't expect to use the pools to swim, they are too small - 2 strokes and you hit the wall.
The rooms are "weird" with the curve and the bathroom design will cause distractions to your roomie if you need to use it at night as the door is frosted and the sink in the room itself. The beds are also curved, I guess to fit with the room curve, so they seem small and you feet fall off the corners.
When we completed the cruise were sad to go, little knowing just how different our Carnival experience would be.
In summary we found the EPIC, outside of the room design, to be superior in all areas when compared to the Carnival Liberty. Food quality, friendly and efficient staff and ship cleanliness. I know you get what you pay for and we did pay more to be on the EPIC but it was the more enjoyable part of our 2 week cruising vacation.