To be honest, it's hard to determine casino's trustworthiness by only looking at reviews. Many people post a negative review if they lose and don't profit from casino and that's wrong, that doesn't make casino a scam company. If casino pays on time and has no technical problems with good customer support and response time, then they deserve positive reviews but people rarely consider these criterias.
Critic reviews and user reviews do help to a certain extent, but your own review is what should matter the most. You should invest small amounts initially and check if you are satisfied with all aspects of the crypto gambling site that you are interested in.
If you are satisfied, you should proceed to invest bigger amounts. If not, you should avoid the site. Simple!