I love mole (sauce) with chicken. It is delicious. But most of my Americans friends have never tried it.
See, the dark color is because the sauce has chocolate in it. But it doesn't taste like chocolate at all. It justs a small part of the ingredients in the sauce.
Mole poblano contains about 20 ingredients, including chili peppers and chocolate, which works to counteract the heat of the chili peppers, but the chocolate does not dominate. It helps give the sauce its dark color, but this is also provided by the mulato peppers.