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Sometimes you also need to see who are those people gives their feedbacks because sometimes there are casino thread creator pays a thread bumper just to show to the forum users that they have relevance and their casino is good according to their paid reviews. But threads here is really a good reference its just we need to scan those reviews if that one came from legitimate people who test their casino and not those fake nor spamming users.
I personally wouldn't worry about such cases. bitcointalk is not kind of site where an unfair review of a gambling site can go unnoticed and just hang there forever. Write such a review and a massive backlash is unavoidable. Overall, it will do no good to a site that wanted to misrepresent itself.
Bitcointalk is not that kind of a forum. If someone is caught doping such things then apart from the backlash they might also get banned or might get an instant negative trust for scamming. There have been instances in the past so there are a lot of mechanism in place here. I would always believe on the feedback left on the respective threads by forum user.