Recently, I've met some people who have a bad memory in PFS. The GM they met before was so terrible that made them lose their confidence. High death rate, doing everything possible to prevent them from getting rewards (Gold, PP, boon, etc), taking a perverse pleasure in upsetting people.
It took me a long time to make them understand the game wasn't playing like that. Is it some ways to avoid these things? Let PC able to check the record of GM? So they can avoid the GM whose game have an abnormal death rate
