I think Eminem is a VERY talented rapper. I haven't seen the movie, but I will make it a point to rent it one day.
I don't own any Eminem CD's, but his lyrics, although irreverent, are pointed and real. He doesn't talk about bling-blinging, and smoking blunts. You can actually tell that what he says is true. He likes to eat vicoden and drink whiskey, and he has no respect for the women who have been important in his life.
He's not living a lie, he's a shitty person and he tells the world he is. But the way he tells it is damned entertaining to listen to. That's why I'm a "fan" of Eminem.