I read white paper but not always, I follow ICO review expert and research on the project team of professionals.
Me too. To be honest, I don't read wite paper so often. I think almost all of them are promising. I folow the opinion of my experts. The best of them is my good friend in the team who feels nice projects 
But it is good too if you read whitepaper, then follow the opinion of the experts and research for the background of them team regarding their profession/expertise. If you do all that I guess you will not be scam on a fake ICOs.