The prose isn't necessarily any better or worse, but the writing often comes across as worse because I think many people are more sensitive to the context of romance than to other situations.
"Oh, [CHARNAME]. I know that I'm a devout pacifist druid of Eldath and you're a halfling cleric of Talos, the Lord of Storms, but... as I stand next to you among this pile of fourteen freshly fireball-charred goblin corpses, I really feel something special between us. It's the sort of bond that could only be felt between me and someone like you, someone with the [PROTAGONIST] tag."
3. Shut up and get out of my face.
"Oh... oh, [CHARNAME], how could you? After that one previous node of dialogue where you gave a non-hostile response, I thought I was something special to you! Well now I see I was wrong!"
5. I hate you and hope that the Lord of Storms consumes you with a divine call lightning spell.
"Okay, I'll end this dialogue now, but you better know there's only one more floor trigger that's going to give you the option to be my sweetheart!"