m'baku was actually fine. that scene was enjoyable to me because a) they are barking like gorillas, not dogs (m'baku is man-ape, fyi) and b) these guys had BARELY any respect for wakanda and even less for outsiders. i took angela basset's look being embarrassed about dr watson, not m'baku. it made sense to me that when some outsider decides to talk to the ruler of the tribe like he's a good buddy, he's going to get shot down real hard. the idea that even though these people are extremely advanced, they hold VERY tight to their tribal laws COULD have been an interesting thing, but they never really explained WHY they do that. there could have been some great dialogue with bilbo trying to come in all CIA smooth and having it completely backfire on him. i mean, they did that but it was more like "silly white boy" instead of "disrespectful american"
i would have been SOOOOO much better with that kind of a story.