Personally I liked Halsin a lot and thought he was very sweet and open about himself. I thought it was great that he wouldn't settle for a monogamous relationship.

The only thing that I would have wished is that he'd tell about his relationship preferences earlier in the dialogue (when he is too busy with his responsibilities to start a relationship), so players wouldn't end other relationships for him. Even that wouldn't be a problem in my books if you could remedy a relationship that you have said no before. I mean it's hardly his fault if I as a player go around ending my relationships in hopes of winning him over. :'D

Also I wished that there'd be more dialogue with him. In my playthrough he adored my Tav to heavens from the start, so there weren't much development other than the sex scene and a little chat in the end.