to be honest the only reason Sombra's was bad, was because her hair and makeup clashed really bad.

Like Widowmaker, she had purple make up--- unlike widowmaker, she was wearing a LOT of red whilst Widow had like no red on her.

the purple make up on Sombra clashed with the red, and thus, her entire design was off-putting.

Plus, the things in her head, with the hair, looked unnatural and strange. They should've either kept the original hair or removed the head things.