If no one plays in a casino who will ever write a review right? Maybe just do a test deposit of about 0.001 or near that just to try out all the features of the casino and play with that. If you can, you should probably also try out their withdrawal feature.
I believe usually people do start with new gambling site only with faucets or free giveaways given through this forum. In another cases, like you have mentioned some big whales will throw away some test amount for this community. I mean to say there are a lot of possibilities to have review for every new casino. So, there will be enough meaning on waiting for reviews.