The forum is more reliable than any other source, at least here we can read real comments and not those that are only paid by the gambling site as their way to market to clients. here also, if they will not solve any complaint, that would affect their reputation and it will very visible as DT members will likely tag them for that.
You are right and I agree with you that forum is the best reliable source to know which gamble site we should use and which we should not. From this platform we are able to understand which users are commenting perfectly and which are advocating a gambling site to promote a gambling site. Only newbie account and account with negative trust can post false information others will not do that ever.
Bitcointalk has the reputation here to know one of the best crypto gambling site to use which is quite very easy than looking for reviews from various sites that could be misleading most time. There are more gamblers here who know what is happening in the gambling world so it is very easy to check here always for better gambling sites.