Sometimes Ouija works for some people & its predictions have been stsrtingly accurate. However it never worked fir me. I guess I just didn't have the knack for activating the Spirits.
I think they work depending on your energy/intent. They are bad if you have bad energy or fear, give you some accurate information if you go in with an open heart, and are useless if you're not a good channel.
I haven't used one in a long time, but I'll never forget the night it told me who I was going to marry, before I met him. Completely accurate, down to where I would meet him.