The problem that lies there is I will say "Drop dead" differently. I may say it with anger, or bit of humor, sarcasm, in a loud tone, or a small tone. Even simple phrases ruins the immersion. As long as there's the option to turn it off, I'm pretty much fine with everything else. I can't base dialogue off two NPC's being:
1) A robot that was your maid
2) A dog
Throw tons of unique perks in the game with fun meaningful quests and I'm good to go.