he has a lot going for him what women like in man when looking at his CV:
- psychotic temper tantrums like an 8 year old
- murdered millions of people and genocidal tendencies
- murdered her loved mentor Han because he wants to be fully bad side-y
- is likely blood related to her (what's in the family stays in the family)
- abducted her and uttered rape-y things and Force probes her mind
- sliced her best sidekick into a coma
- pushed into the tree tops and fought her
- got defeated by her several times including scarred and emasculated by cutting his little saber
Yeah, I see it, a real "moanster" of a love interest. Even when she says "no", the writers know she really means "yes".