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 More
restrooms commonly had broken hand dryers and no paper towels, so we were left to dry our hands on our clothes.
The buffet food was bland, but the dining room food wasn't bad (I'd say a notch below most chain restaurants). Most crew members were polite, and a few were a pleasure to interact with, but the people selling shots from the bar during dinner were loud and pushy, shouting something like "Shot of the night!" and challenging you to drink as they walked by the table.
Getting off of the ship at the ports involved unusually long lines. It didn't help that they had photographers taking pictures of guests disembarking immediately after security, holding up the line.
The theater shows were not at all entertaining and incredibly cheesy (we left after a few minutes, they were truly cringe-inducing), but the musicians around the ship were very talented, particularly the latin band.
Overall, we knew this was an older ship and expected it to be a bit worn. We were fine with that. We didn't, however, expect to have the cabin so dirty that we were uncomfortable in our own room. We had a great time despite the condition of the ship, but that had nothing to do with Carnival and everything to do with the ocean and the islands. It's not likely we'd ever take another Carnival cruise after this one, and after a few days on the Victory we're happy to be back on land showering in clean bathrooms before sleeping on clean sheets. Less