Without being biase on my choices, I think most of the Affican nations a likely not going to make it past group stage. The few that would would likely get eliminated in the round of 16. Ghana most especially seems to have been placed in a group of death with Portugal, Uruguay and South Korea, no bad feelings but its game over. From the way I see it, they are the least in that group although, not to mind the best doesn't always wins but most times, they do and this is world cup.
Anyway if I'm to pick those I project to lift the trophy and other consolation prizes, I'll go with;
1. Germany
2. Belgium
3. Brazil
I'm sure they've got a few flaws but, that's my pick.
African countries are not so favored in the World Cup, because this country is not dominated by star players who have been successful in any football competition. Even if there are, no more than a few people, the focus of football is always on big countries producing star players, such as Brazil and Germany, although there are still many other countries that have very good soccer stars, but I only want to discuss the three countries that you mentioned. mention, Germany, Belgium and Brazil.
These three countries are more favored by Brazil, because there are many football stars playing in all the best leagues at the moment, Likewise with Germany, there are many great players here, but if you look at the star class there are not more stars than Brazil, while Belgium has recently emerged some stars, in experience they are far behind Brazil and Germany.