Not the worst game I've played, but probably the worst in recent memory, but The Evil Within 2 was absolutely terrible. I played 1 and 2 back to back, and 2 was just so much worse than 1.
First and foremost, say that you'd be happy to give a reference for them and congratulate them. After that, maybe setup a meeting to discuss if you can get them to stay, what would it take, etc.