Quarian; considered due to cybernetic augmentation, weakened immune system too debilitating.
Drell; useless, insufficient numbers.
Human; viable possibility, aggression factor useful if controlled.
Asari; reliance upon alien species for reproduction shows genetic weakness.
Salarian; insufficient lifespan, fragile genetic structure.
Human; viable possibility, impressive genetic malleability.
Geth; an annoyance, limited utility.
Human; viable possibility, impressive technical potential.
Human; viable possibility, if emotional drives are subjugated.
Human; viable possibility, great biotic potential.
Krogan; sterilised race, potential wasted.
Turian; you are considered...too primitive.
Bolded = Why?