I'm sorry, the other actors simply had better, and more fun roles. All Halsin provides is thirst. Larian knows it, and deep down most people do too. That's honestly the biggest reason why he was even nominated. Had they made other romanceable male characters as buff as him (Wyll or Gale), he would probably recieve a quarter of the attention he currently has and that's being generous. Remove his looks, he has nothing. That's all there is to it.
With that being said, I think Raphael's voice actor should win. He was phenomenal.