And that's what Eminem is.
He's this generations Billy Idol, in that he pretends to be something he isn't. Billy Idol pretended to be some mad punk. Except when he was sipping champagne with the record bosses. It's the same with Mr Malteaser, sorry "M and M".
And rapping isn't hard at all. Playing an instrument and writing a song with melody and lyrics is hard.
Rappers just string a lot of words together and if they don't rhyme then they make them up.
And before you all jump on me - RAPPING ISN'T MEANT TO BE HARD TO DO!
That's the whole point. You don't need to be a great musical talent to rap, the same way as you didn't have to be a great musical talent to be in a punk band.
To rap, you just have to be able to speak.