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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.