Hi Paddy,
The best way to have good content and not being penalized by search engines is to write your own, unique content.
The best way is to search the net, see what people is doing and write your reviews and articles.
If you need game rules and strategies, there are certain casinos that offer you that, as long as casino reviews. My advice is to base your articles on that but do not copy. They allow you to copy the integral text but google will find duplicate content and it is capable of knowing wich one is the original, and will penalize you for that.