You can determine the authenticity of casino through comparison,because theirs already running casino which you as experienced casino gambler will compare with,so I believe that in gambling you have to know good gambling websites through the reviews, so as I portrayed before
OP is asking about how to determine the authenticity of the casino’s review not the authenticity of the casino itself.
Besides, what you suggested requires that the users tests every casino by himself which includes making deposits, playing games and testing different features.. Casino reviews exist to save you this hassle.