Feedbacks from the community is the most common factor when there's someone looking a new gambling website not only by the review on the site. The community will express their experienced and give insight into it so that you have an idea of what was inside when you register for the site. Another is their announcement thread if there is that is very important and then next followed by the TOS and the FAQ that should everyone look after before they use to avoid possible unwanted violations.
Sometimes promotions will get interest for most gamblers if there is a new gambling website.
this is why it is better to try a new casino that published their thread here in the forum. because in case you get rekt, you can always contact the owner or give negative feedback, if in case they will not resolve your case, so other players will be notified about their activity.
also, if you want to try a new site, it is always better to try it with small funds, read their ToS, so you will not regret if something will happen to your account. check also if their support is prompt with their response.