Haejin and MSC - Linkin Park the "best music group" EVER??! Boy, you two really show your age. Personally, I find their lyrics to be somewhat corny, their sound too rehearsed (i.e. "studio"), although I'll admit their music can be hefty and powerful.
I don't see what people have against rappers. Linkin Park is actually not pure art-rock - their music is more rock/rap, w/ a bit of metal thrown in.
And Nas has put out some damn good stuff. Don't disaparage his work just because it's not your genre.