I read many reviews where the writers complains that the noise in their cabins was so loud that they couldn't sleep at night. It ruins their whole cruise experience.
If you are an experienced cruiser you know enough to avoid these obvious cabin locations. Or, if you book through a travel agent, the agent would point out poor choices of cabins. But newbies who are doing cabin selection on their own often don't know enough to be so careful.. Here's a link to the biggest noise offenders.