Yes, this is true.
What many (including myself - a chap of African lineage) see as "Africa" is a media-tinted view - i.e. small little black children wandering aimlessly around waiting for the dashing European to come and scoop them up in his arms and feed them; war; famine; war; war; barbarism; disease; war; war; disease. You get the picture.
However, what is known as "the West" (particularly the United States and Britain) like to portray a world where "the West" is the bastion of advancement and civilisation and the rest of the world is a barbaric hellhole. Funnily enough, even in parts of the Middle East flowing with black gold, some of those countries are building skyscraper after skyscraper by the minute.
In any case, yes, indeed, there is much negativity surrounding Africa as a whole (particularly, Sub-Saharan Africa). However, take comfort - history shows that different societies fall and rise. Ergo, with the direction many countries in Africa are going now, we can be confident that the continent will be much, much more influential, powerful and wealthy in the coming decades. However, this is not to forget some of the large barren wildernesses within the continent and how such long distances affect the development of advanced societies.
Finally, we also mustn't forget the issue of resources. The continent as a whole holds the large majority of Earth's resources (some 70% or more). This is both good and bad, especially in light of the coming decades. In other words, you only need to look at China's increasing entrenchment on the continent. And rest assured, once many countries such as the United States see the oil of the Middle East dwindle (and after they're done with Iran of course which has lots of black gold itself), countries will increasingly focus on the continent once again - that is, further plunder it, unless African countries get their act together and build strong societies to safeguard against hegemonic external forces. Emphasis must be placed upon intra-continental trade and cooperation, not simply inter-continental trade.
I agree with the not writing off an entire continent - there are plenty of success stories in Africa, but...
Nigeria is pretty much the most corrupt country in the world. Most of that wealth comes from overpaid officials who are skimming off exorbitant amounts of the oil revenue. Sure life's good for middle class residents in Lagos, but the average Nigerian has actually seen their income go down following the development of the oil industry from the 1970s.
You should of probably picked Botswana if you wanted a happier example.
Well duhh, every country has rich and poor parts. Are we supposed to be surprised or something