I don't care whether the reviews are positive or negative, the first concern for me is that the reviews are real and not manipulated one or paid ones. No matter how much trusted the casino is, you will get a mixture of good and bad reviews (though good reviews will be more) and that is the best to judge the platform and know what its strengths and what are its weak points.
The main problem is that it is not easy to know whether a review site is manipulated or not, being paid or not, honest or not.
Especially for newbies in this gambling industry, it will hard for them to validate review sites so if we are talking about crypto casinos, this forum should be the first place to go to find information about the crypto casino.
If ever I develop any casino review site, I will allow a section where the gamblers are allowed to post freely and those comments are published on the site without being censored or edited. This will help to know the true feedback of the casino site.
Allowing players to write their own comments/feedback in your review site is good but you also need a filter for it.
Without good filter, players may write something really bad about the casinos just because they lose money.
Without good filter, casinos may ask their players to write something great about the casino by offering few bucks.