Nah, I like to view them as another species altogether - a species that humans happened upon by chance that doesn't necessarily help or hurt their survival. I don't know what Asari is, so I can't speak to that. But I'd prefer a universe that has more than Aliens and Predators in it, though not necessarily other beings that will get involved in our troubles (to prevent it from getting too overloaded with beings a la Mass Effect or Halo. This is a horror genre.)