After sailing on at least ten different cruises (three on Carnival in the past decade), this is the only one I would describe as bad.
My wife and I stayed in a balcony stateroom. The bathroom was downright gross. The toilet seat had some mysterious stains on it, and the inside of the bowl had a black ring inside it. The shower had mold on the tiles and the placement of the shampoo/shower gel dispenser (I believe it was installed later in the ship's life) made it impossible to shower to without constantly hitting your shoulder in the cramped space. The bed sheets had stains on them, the wall near the balcony door clearly had a drink spilled on it during a previous cruise that was never cleaned up, and the balcony door wouldn't close properly. During our sea day, the water in our hallway was shut off without notice, causing us to fear that we were about to be part of Poop Cruise II. Fortunately, it was restored within a couple of hours.
Outside of the cabin, the public restrooms commonly had broken hand dryers and no paper towels, so we were left to dry our hands on our clothes.