Ruderalis is basically only good for making HYBRIDS with Sativa or Indica strains because Ruderalis characteristics is as follows: VERY low in THC; Very low in cannabinoids (THE THINGS THAT GET YOU HIGH)

So yea, when ruderalis is bred with a good strain (high enough in THC to make up for the lack of in the ruderalis), it creates a strain that flowers based on its age, rather than light cycles (autoflowering) i.g. Lowrider strain