I have seen good businesses go under because of malicious posting campaigns on TA. Don't forget that TA is partners with Expedia Travelocity, Hotels dot com etc. So when they do business with you and get your commission, they are more willing to remove bad posts. I know someone who gets his bad posts removed each and every time. When you don't do business with them, they keep you hanging to dry. The people that man TA have got no clue what so ever about the destinations they talk about. Some people posting on there are really miserable. The whole site radiates negative energy.
That being said, I also look at TA, but don't look for the top rated hotels. It is pretty tough looking through their smokescreen, but the best hotels are usually not in the top 5. Their rating system is pretty subjective.