When I first saw advertisements for The Slim Shady LP, I was so ready to write off Eminem as another Vanilla Ice, and didn't give a rat's ass about Dr. Dre producing. I knew nothing about his underground reputation, and just didn't care. Then I heard "My Name Is. . " and thought it was funny and appealing enough to listen to the album, and I was just floored. In my opinion, he was the last real MC to be totally deserving of the amount of mainstream praise he received. What I mean is, every three or four years, you have that one rapper in the mainstream that comes out of nowhere and is pretty much annointed by the media as the standard by which all other rappers in the mainstream are measured. When everyone was all about the West Coast in the early 90s, Biggie came outta nowhere and became the standard. Yeah, you had Jay-Z for a while, but as big as he was, he was already in something of a mainstream spotlight. he didn't just appear outta thin air and EVERYONE was all about Jay-Z. But when Eminem came out, aside from some underground stuff, nobody knew jack about him. She when Slim Shady came out, it was pretty much this explosion where it was all about him.
By comparison, guys like 50 Cent and Lil' Wayne weren't and (in my opinion) still aren't as good lyrically as Em was. Mind you, I'm not too confident in what Eminem may be working on now, if "Crack a Bottle" is any indication.