I support what cabron has said, this days, alot of things are changing really fast, it's not just in the tech industry or market, but some casinos are also changing rules and updating their terms of service sometimes without even letting their customers know, running a review site will require you not just depend on what people say about a casino, but it will require you to use a casino yourself, have your own experience with the casino, this will help you write better and honest reviews.
You made a great point here, Op testing those sites himself will make much of sense, as they say experience is the best teacher and this will help the Op make a better choice of Casino site to list on his website as reputable and trusted Casino platforms because sometimes people write reviews that doesn't actually reflect the way a site works because some of this Casino platforms go extent to pay people to write reviews about their sites and in this case, people may not write their honest opinion about and their experiences with this platform, But op trying as much as he can to use those sites himself, will really help a lot in making better choice of good Casino site to list and coupled with the help of reviews from other user.