There's no doubt that Eminem is talented, when he's at his best he is amazing, but he's been making so much crap in recent years that I just kind of stopped listening. His performance in Forever by Drake is great though, I like it when he does is more "hardcoe" stuff, that's the only word I can think of to describe it, that's what he's good at in my opinion. Still though, Jay-Z beats him for me, I've seen Jay-Z live and it was the third best show I've been to, only beaten by Foo Fighters (Who I've loved for years and probably always will, Dave Grohl was a big part of my childhood and early teens) and AC/DC who are simply legends, that show kicked all kinds of ass.

EDIT: Bedrock...wow, that whole song is based on a horrible pick up line, I don't really like that song. If you search for Todd in the Shadows on youtube he has a review of that song, and lots of other great reviews you should check out on current popmusic.

Oh and, Gudda Gudda? Seriously? He couldn't find a better name than that? Come on.

The thing that really made me go "wow" about Eminem was his freestyle ability..I've never heard a freestyle better than Fubba U Cubba Cubba, which is a freestyle he did that was turned into a song by a bunch of remixers, but it wasn't an official song of his.
http://www.youtube.com/watch?v=Zw3j4fJq5P4 is the link, it's pretty crazy to know that's a freestyle considering how good it is.