IMHO boost at low RPM is not bad, actually it's good if you can get it.
Typically the above statement is made in respect to the part throttle full boost issue. this is where the car stays in closed loop fueling mode and you are running 14.7:1 AFR at lower rpms and full boost. Which as you know is very bad.
IMO if you have correct fueling and timing then having boost at lower rpms is a good thing.
I would like to see other comments on this issue as their maybe aspects of lower rpm boost that I have not thought about.