To give credit where it's due, travelling with dogmeat is actually a pretty good experience. I like the way he travels by your side or ahead of you, instead of following you. It's the little things, right, but it actually brings a lot. Nice little ideas, with the dog fetching specific items for you, the possibility of petting him and giving him accessories and stuff. Probably the only companion I never got mad at.
I like the "idea" of Curie, and her voice (I'm french btw, so there's that. Familiar accents probably bring some sort of comfort zone, I guess), however, I rarely travelled with her because it would be incredibly stupid and unimmersive. Mrs. Shiny Baguette outsmarted the entire Institute in medical research while being nothing more than a 2 century old, personalized butler. She can potentially cure everyone of everything, if given time and resources (hey, good thing the Environment Protection Agency still has vaults, and the daughters of Hecate have the nursery, right? Wait, how come bringing her there is not the main story? How come is she not the hero, and I'm not helping her? She is WAY more important than the sole survivor, when you think about it). Bringing her into danger would be more than stupid, it would be the work of someone without empathy or interest for the world beyond his immediate surroundings.
I really liked Cait for a moment, her backstory is even interesting (too bad you cannot ask her about Europe though, but hey, it's not like the sole survivor cares about the survival of billions of people), but her quest is stupid as hell. Cleaning your blood of chems to heal from addiction? That's the kind of "solution" a child could have thought of, not a young adult who is supposed to have basic knowledge. Cause it does jackshit to your addiction. It just makes your body clean until the next fix, and that could be achieved by going to a sauna. Curing from addiction comes next, and it's the hard part that can take weeks, months... wasted opportunity for a series of speech checks to boost her morale and resolve during the struggle AFTER the cleaning. And nobody else was bothered by the fact that you have to invade a gang's home, and kill them all, unprovoked? I like the pew pew as much as everybody, but I did not roleplay Hitler, thank you. I roleplay Nathan, former soldier and now survivor, who kills when necessary, or when ordered to by his superiors, not when he feels that his buddy's health matters more than an entire group of people's lives, even if these guys were -maybe- scum.
Oh, and her approval system is a bit weird. I mean, the gal got turned on and yet, started talking about her super dead parents and her drug problems the moment I killed Danse, because "Cait loved that". Which was a bit messed up, in my opinion.