I watched it, and can verify that "YES" it does tell a good yet hash movie that's somehow kinda heartwarming.
As for if he plays the role good, I'd have to say I have no idea who he is, and seemed to be doing a Very top notch job of replicating the role of a burnt out pimp.
The only problem I had (which is anal) is when the music started sounded like the rap was bearable and not totally amaturish, the voices were not even close to sounding like they could come from the same person, no matter how much practice and voice box machines were involved.
If you're curious, go see it, it's a good movie.