Are they? After watching USA, Canada and Mexico I would say not.
Their defensive game has come on but at the expense of their creative side it appears
I'd also ask how many African sides would be favourites against Japan or South Korea?
One problem with African football is they have quite a lot of teams of a similar quality, but maybe not the outstanding teams other continents have. I think they have another 5 teams as good those who have qualified, but the qualification process limits them to 5.
By contrast, North America and Asia have teams who are usually better than the rest of their continent and qualify for most tournaments. However, I do wonder if the depth is there below the top levels.