True dat! I've bought 2 GKs and also sold 2 GKs just at the beginning of this season. It's a 4* and a 5* GK with performance average less than 6. On the other side my 3* GK often get 7 ratings and a clean sheet. But sadly he is still struggling with injury so I have to buy another goalkeeper. Despite having clean sheet, my new 4* GK only rated 6 on my last game. Weird.