We cruised with Carnival three years ago (same ship) and noticed some changes this time around and not for the better.
The biggest disappointment would have to be the quality and even the quantity or availability of the food.
The buffet was closed between lunch and dinner which meant if you did not have lunch before it closed down, you were outta luck unless you wanted yet another pizza (tasteless) or another burger (very good but not something I wanted to have EVERY day).
Cabin 8430, Carnival Liberty
Three people fit comfortably
Very comfy beds
Adequate closet space
Good bathroom - size and location
Balcony was a decent size