Not sure what exactly rough entail in this case. They should not feel like any metallic friction. However, the magnetic poles can be felt when you turn the propellers by hand, and turning them fast, will give a humming noise.
Just make sure that neither motors, nor propellers have any play, all must be firm or there could come unintended vibrations that could lead to damage and excess noise when flying.
Sometime the propellers get worn at the fixture to the motors. If that can be felt, change the propellers. If they still feel loose, then I would contact the seller and say they must send you new fixtures for the motors (assuming you feel like changing them yourself and the seller allow it).