Who are all going to write reviews and keep adding them? You and your team? I hate such a centralized things.
A community based reviews with discussions/commenting option must be the right way of having a portal for reviews. Because that would help filtering biased reviews out.
Initially you may start with good intentions but over the time once you gain significant traffic, casino owners will offer you big money to get them reviewed 5 stared or top ranked. We do not want such a review portal. Usually people do start this kind of review things just for affiliate boosting.
Moreover individual's or one teams' reviews are not good to be followed. You may get proved good or paid shill in very short period of time as people here are fairly experienced gamblers and can easily identify the nature of the review you will provide.
That's what they should do to have good reviews rather than what you have mentioned. I have search for a review of a certain site and after than I tried the casino but their review is not what they have shown in their review site. I search again until I found the more accurate review and know that the site I search is not what the review stated.