Players are getting worse. I join up in games and have 2 or 3 of the same character, regularly no healer or tank.
I tend not to play tank or healer just because all the other players do is run off and solo. There's no one to heal, and no one to tank for. And, usually, even if I can tank or heal for them, they're so bad that there's no point since they don't output any damage.
Just waiting for a proper ladder system.