Whenever I'm getting ready to go somewhere, I make a point of reading the bad reviews and ignoring most of the good ones. I look for the bad reviews where specific compaints appear repeatedly. It's easy to spot the whiners and ignore them. I have seen a complaint here and there about engine troubles, but it didn't seem like any more than most other ships with a year or two on them. The only complaint that truly worried me was the one about the brown water. But I have posted about that and have gotten replies that others have never experienced the brown water. So maybe...maybe no. I don't plan to drink out of the bathroom tap anyway, and I'm bringing my own bottled water as always, so I doubt this is a real problem unless it smells. Even then, I have an automatic air freshener I bring along.
What I have heard about the amazing service that resides particularly on the Holiday (not necessarily on Carnival in general) makes me want to sail her and take my chances with the plumbing. One of the rare times I've given attention to positive reviews, which very often consist of "had a great time...would go again." (Oh, that's very helpful. Thanks.)