This is what I care about in a casino website. Firstly, it should have many types of games like sports, esports, and blackjack. (But this is not always important; sometimes I still play on a website that only offers one game.) Secondly, does the website provide a tutorial or a free trial to test games? (Sometimes I don't know how to play a game, and I don't want to spend time depositing money to see if it's fun or not.) Thirdly, speed is important. How long does it take to register, to deposit, and to withdraw? Lastly, having many reviews from various users is the best.
Are you care free trial for gambling? Gamblers I think know enough about gambling that there is no need to have a free trial for them. And those who do not know about gambling should not gamble. Because if you don't know about gambling, you don't know the purpose of gambling. However, I find it absurd to include these topics in a casino review. I think highlighting about Min / Max Deposit/withdrawal limit and all other types of bonuses apart from kyc will attract gamblers more.
Depending on the game, a free trial could be unnecessary or critical, when it comes to classic games like roulette or blackjack I do not think this is needed as most gamblers would probably know how to play those games anyway, but when it comes to new games or old games with new mechanics then I think it makes sense for a trial to exist, so gamblers can familiarize themselves with the game and decide whether they find the game fun enough to use their money to play it.