From a rapper's perspective how good is SVT actually at rapping?

I've heard that rap in KPOP isn't that great. Those that are great are ones that started out as a rapper before an idol.

So as an amateur to the world of rap, I was curious what rappers actually think of SVT's rapping skills, specifically the HHU? How would you break down each of their styles? What are some strengths and weaknesses to their style of rap? Which member would you say is the best at rapping? Thanks in advance!