I saw "LUV" in the theater when it was released and I agree,
Common gave his best performance in that film. It was so interesting
to see the original Sister from "Sparkle", Lonette McKee playing his mom.

But I have to say most rappers who become actors are not very good.
They have no training, like true thespians Viola Davis or Denzel Washington who went to drama school and paid their dues doing theatre and Broadway, and they don't take the craft seriously. There are a few exceptions like 2Pac and Will Smith (7 Pounds, Pursuit of Happiness).
Rappers need to perfect their craft doing theater then they should transition into film.