A caste system with a royal family and a slave class, -and- eugenics.
The Inhumans really are a big mess of uncomfortable, aren't they. And yet this is what Marvel has hung its hopes on.
The Inhumans' Slave Class Makes The Heroes Impossible To Root For The Inhumans' royal family, especially Black Bolt and Medusa, just aren't very likable. Is it maybe because they practice eugenics and own slaves