the reactions coming out of the Black Panther screenings in Africa itself have tended to be positive, with the movie making big money in both East, West and South Africa. People are positive about the emphasis on 'hi-tech' modern Africa rather than the crisis and poverty and the fact that a big budget superhero now exists that talks with an African accent (almost), wears kente cloth and looks 'African'. (as a Polynesian I saw the same reaction to Disneys Moana, such that even my 16 year old neice bought a Moana blanket).
Nonetheless that ignores the fact that Wakanda survived and flourished due to being built on 10000 tonnes of Vibranium - thats the fictional part which means that it lackls relevance to the real world and we will never no what uncolonised Uganda might have been like sans Vibranium.
(Theres also criticisms of Ross role as CIA stooge and the whole Killmonger was the true hero angle but that gets into politics we don't want)