you should not look for hotel reviews on TripAdvisor. You would better look for reviews on Booking.com, as they allow reviews only from people who has booked the hotel and lived there. The fake reviews will be very expensive as the property owner pays 20% of price to the Booking.com.
do not read reviews from people, which are from the same country the hotel is located in.
read bad reviews, not good ones. The bad always include issues in the hotel. If people tell it is noisy, in reality it is.
pay attention to the rating. If the hotel has more than 20 reviews in Booking.com and rating more than 9.0, it is good. If the rating is lower, this means the hotel has some issues.
the rating is not connected with price. I was staying in extremely cheap hotels with great comfort and in expensive ones with poor experience.
read reviews in different languages. I have noticed that Russian people notice less issues in hotel, than people from USA.