First time Carnival Cruiser. We selected the DREAM because it was a newer ship, and fit our dates and itinerary. Overall it was fine, but we'd not rush back to sail with the line or this ship.
Overall: Clean, Courteous crew, nicely out-fitted ship. Crowded in the public spaces and pools are way too small for a ship this size with this many passengers. Food is average, about like that on a college campus. On and off the ship is done easily and efficiently.
Many of the reviews on this site are spot-on accurate.
7456: Fantastic Balcony (extended). Quiet, decent size, a shower you can fit in. Really could use a chair to sit in, but sadly you have only the bed to use and a small makeup stool.