I disagree about Winky. Where does she ever defy her master? I also disagree partially about Kreacher... he defies Sirius, but Sirius was kicked out of the family. He remains loyal to the "true" Blacks.

But you're right, it's a nasty curse. Maybe related to the Imperius.

I'm not sure whose side they'd be on in a war. Wouldn't it be interesting if it became a four-way conflict... the DEs, the Order, the Ministry, and the disgruntled and mistreated creatures!