The early word from the ATL movie is that T.I. and Big Boi do a capable job in their turn as actors. You have to wonder though, would talented Black actors have brought even more to the roles?
If a male Black actor claps every time a rapper dies, then you can't blame him. For the past decade there's been a cascade of emcees putting quotes in their government names and making the flip to Hollywood, word to Chris 'Ludacris' Bridges. In the past rappers were regulated in movies to bit parts for marketing purposes while the real actors shined. Now they play the stars while the pro actors stand around as props.
I call this the Larenz Tate Phenomenon.