When I said useless I mean full on rolling If you take a top black belt brown belt etc and put them in against a white belt or blue belt at full speed most times the white or blue belt is going to get tapped very quickly and not really learn as much that's what i meant as useless. Now rolling with a black belt or instructor where the instructor is defending etc while the lower rank goes his best that is a different story. It's too bad you have been to some schools like that and I agree with you I would not train there.