User reviews and expert reviews both have their merits. As mentioned above, sometimes user reviews are influenced by bias and inexperience.
You'll have someone complaining on Reddit that their full cashout was not paid to them, but it was clearly stated in the terms and conditions that the bonus claimed was non-cashable.
Expert reviews have people familiar with the industry writing them but can sometimes be influenced by affiliate deals (depending on the site.)
The best thing to do is to read a mixture of both expert and user reviews to understand better what is truly happening at a casino.