I agree with everything Asp said.
Also, to take away the personal stories in his rhymes, or to take away the funny carefree side of him, is to make him one dimensional. That's why I think Eminem is special when it comes to Emcees, he has it all. Emcee/lyricist skills, funny/humour/entertainment, heartfelt/emotional stories and dark conceptual fictional raps.
The songs he's doing now, like Shake that Ass and Smack That, are just proof that Eminem is trying to be successful in yet another facet of hip-hop that he hasn`t touched on yet, club songs.
I think if you're measuring greatness, versatility goes a hell of a long way.
Eminem's not doing the club songs for the sales or money, I think he already sells enough without doing that shit, it's just him trying to dominate rap from every angle.
But, don`t get me wrong, I`ll take a "Till I Collapse" or "Kim" before I'd take a "Fack" or "Smack That". But, I'd still want the those last 2 tracks too!
