I am huge fan of Toumani Diabate and will buy anything with his name on it. I say this, so that the reader can understand where I am coming from. With that in mind, I'd also add that I am unfamiliar with Arnaldo Antunes or Edgard Scandurra, since I don't follow Brazilian music.
Is it telling that, after listening to this album, I don't find myself searching for more Brazilian music? Like the other reviewer mentioned, this album is more Brazilian than Malian. It doesn't even really feel like a properly fleshed collaboration. At times it feels like a Brazilian song has the Kora tacked onto it. Kaira, a song from Toumani's debut album sounds completely different and I don't think it comes out of it all that great.
The reason I don't rate this album lower is because, I suspect fans of Antunes and Scandurra will find it very enjoyable and refreshing. Toumani has done collaborations before and I am buying the music because I know the one chance he gets to exert himself will be worth the cost of admission. On Kulanjan with Taj Mahal it was K'an Ben and Tunkaranke. To it's credit, I don't think there is a single terrible track on this album. My favorite track, Neblina de Areia is acoustic and lets the instruments do the talking. Toumani gets his chance to shine as he leads.