10 , 100 or 1000 or even 10000 times faster than light is still INCREDIBLE slow, given the ranges involved.
Depends what your definition of "slow" is. If they had FTL that was 10000x the speed of light, even the Quarians could get home in ~8 years. And they'd have the farthest to travel of anyone. I wouldn't call 8 years fast, but most of them would be alive when they got there, all other conditions being equal. They certainly are used to traveling through space.