I actually think that the only reason people find Rumpel a sympathetic villian is because he is male. I think that he is just as evil as Regina maybe even more so because he is behind the curse. And i think that he was still evil before he became the dark one whereas Regina seemed to be kind and want happiness and freedom for herself. I think that both Rumpel and Regina are evil characters and i think the reason that Regina is given so much grief is quite simple, Regina is female and Rumpel is male.