TripAdvisor, and every other site that rates hotels, uses a purely subjective rating system that asks reviewers to also grade location, sleep quality, rooms, service, value, and cleanliness.
But there is one category that is missing, and it's the most important one to me: quiet. The only time I spend in my room is to shower, sleep, and change my clothes. The rest of the time I spend exploring. So all I really care about is how quiet the rooms are. Right now, the only way to find out to post a question for a specific destination before I leave, and see who responds.
Here are a few examples of what I mean:
I stayed at a motel in the Florida Keys that fronted the highway. It was quiet at night when I checked, but noisy in the early morning when the trucks got on the road. Another place in the Keys was off the highway, and quiet.
I just stayed in the Luxor in Las Vegas. The rooms all use wall-mounted air conditioners, which are always louder than some central air systems, and the windows didn't open. I turned off the A/C at night even though it was 101 during the day. When I checked into my room at Atlantis in the Bahamas, I wish I'd known that the rooms on one side were all above the air conditioning units that ran all night for the rest of that wing. I knew enough when I booked my room at the hotel in San Francisco, not to get a room that fronted the street with the cable cars, but not everyone may know that.