Yeah, Regina seemed a little horrified at the idea of her mother becoming the Dark One. Also, I suspect that a lack of empathy is part of the Dark One curse–it’s what makes it so easy for Dark One Rumple to kill and control people. I think it’s somewhat balanced out by Mr. Gold, and there’s reason to believe that the Dark One curse is not as strong in our world–or at least that several elements didn’t carry over.
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Keeper of Belle's Gold magic, sand dollar, cloaks, purple FTL outfit, spell scroll, library key, copy of Romeo and Juliet, and cry-muffling pillow, Rumple's doll, overcoat, and strength, and The Timeline. My spreadsheet: https://drive.google.com/file/d/0B6r8CySCCWd9R0RUNm4xR3RhMEU/view?usp=sharing