I kinda disagree with people. Yes it is making fun of people like his old albums, but that's what he's known for. He's always bashed on people in his music. And to the people that complain that he's doing the old stuff, just wait till the album. Songs tend to grow on people after listening to them a lot, but it's a risk to make new stuff, and takes time for it to become accepted. By releasing a SINGLE of his older themes with a new vibe, he's just saying he's back.
Also, his voice control is much better than in his older stuff. If you listen to original, old old Eminem, there's a huge difference. The guy has experience, and it shows.