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Driving it might make those rotors look better, more shiny anyways, looks like they rusted up, then driven a short distance and then pulled off the car. The grooves, it's hard to tell, since they are E420 rotors on a 190 I assume it is driven hard when it is driven, might have an effect, but more likely is just damage from the rust itself, outside chance it is from dirt, rocks, grit I suppose, but probably just from rust.
No idea how to keep them from rusting that isn't a PITA, like pulling them off and storing them someplace dry, or storing the whole car someplace dry, or pulling them and putting a protectant on them, like a paint or oil, something to keep air and moisture from the surface.
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