Roger Miller, in Silver Spring, is the granddaddy of the area's West African restaurants. It is specifically Cameroonian. The menu is both extensive and exotic. Almost all dishes can be ordered with beef, chicken, fish or goat.
And therein lies the problem. The meats are cooked separately from the sauce - so that a groundnut stew with beef, for example, will have dry beef thrown in at the last minute. The sauce doesn't infuse the meat nor is it made savory by the meat. The melon seed stew with goat contained some surprisingly bland pieces of meat.
All the stews and sauces I tried were tasty and interesting, so I do recommend the place for an exotic peek of Cameroon's cuisine, but I think there are ultimately better choices for heartier, soulful cooking.