I've lost multiple nights of Criterion prog at this point. We load in, beat the first boss and then all get kicked out and lose our checkpoint, so no one in the group wants to even try until we know the DDOS is gone.

I've heard from friends doing TOP in PF that it's similarly unplayable: it's a struggle to get 8 players all into the instance, and then someone disconnects during p4 and wipes the group, people get annoyed and leave, etc.