The problem with something like metacritic is you can have a group of people, say that belong to the same f orum or who follow the same youtuber that all encourage each other to give a specific type of review. Whether this happened or not I have no idea, but it can happen and that makes it difficult to use as a way to decide if a game is good or not. You would need a random poll done from a pool of people who played the game, even if that pool was smaller than the ones on metacritic, to give a better idea of what gamers think of FO4. Those who dislike something are also more likely to go out of their way to tell it as well. Thats not a complaint, it's just common sense. If I get a coffee pot and it does it's job, I probably won't say much about it. However if it does something not expected and I don't like, even if it's considered a feature, I will be more likely to complain about it and perhaps go to the manufacture to give feedback.
I'm not personally invested one way or another about the dialogue, (not that I find it perfect either) but if I was trying to figure out if I liked a feature I would most likely not base my choice on metacritic reviews. If i was concerned enough that it was going to effect whether or not I purchased it, I would be better off either watching some video's on that aspect of the game or going to a forum, if I could find one, with like minded people.