Eminem is one of the greatest, all his punch-lines and shit make sense, and his songs are funny as fuck, I think the greatest one he put out was 'My Band' cus that shit was so catchy, tight beat and everythang.But there's still people who are on the same lvl as him, if not better, Nas, Dr.Dre, B.I.G., Tupac, but that's just my opinion.