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.
Apart from their selective combinations of games and their various types, we need to have trust in them in what they could deliver been up to our expectations, also they have to be consistent in what they do, gambling service is not a "on and of'' service, the consistency must be there, we also need to see them work on this over time in other for us to be reliable with them with what they give to the gamblers.