Frogsterking

Why all is /rad considered a bad set and does it have any redeeming qualities or is it just sub par? I was flirting with the idea of making a necro/rad to duo with my gf who is making a claws/willpower catgirl tanker. If anyone has experimented with the new necro and /radiation I'd love advice or recommendations on how to play that set or for a more interesting necro/ option if you think necro/rad sucks.