That's an amazing experience :)
But this is one of his most markable hits and one of the biggest as well, but i feel like Eminem is recognized for having reaallyy mainstream songs like Not Afraid, and it seems like the fact a lot of people enjoy his work, they associate it to his past as well so it can be convincible to this kind of people to call him the greatest of all time.
I like Em and that's just an opinion, to complement, i think it would be cool if you read this, what he has related to the song on Genius:
"This is where I was dealing with critics who didn’t understand why people were identifying with me. I realized I was becoming like the rappers that I looked up to as a kid. I identified with and loved LL Cool J and the Beastie Boys. I felt like if everybody didn’t understand their music, it didn’t matter — they were speaking to me. So that’s what I was trying to make people realize on this track. I may not be shit to you, but there’s a kid in fucking Nebraska, or somewhere, that I’m talking to. I don’t care if you’re listening, because he’s listening. That’s who I’m directing my material at."
Who makes the chorus is the Aerosmith's vocalist Steven Tyler in 2003, not even a sample.
Also, many people don't know, but who makes that Outro with the guitar is the Aerosmith's guitarist as well, Joe Perry.
There are a lot of things involved, that's why in my opinion it's one of the best hip hop songs of all time, plus his best, despite many people wouldn't agree to me on that one.