So does rap.
Of course, if you've never ventured beyond the latest Ja Rule or Soulja Boy single, you might not realize it. Just like someone who's never ventured beyond Papa Roach and Linkin Park might claim that all metal sounds the same. You wouldn't let them get away with that, would you?
For the record, ALL of the things you're saying about rap music are things I've heard people say about metal music: lack of talent, ripping off other songs, dumb and offensive lyrics...I could go on. So isn't it a tiny bit ironic that you're falling over yourself to defend your favorite type of music while ignorantly dismissing an entire genre as derivative and talentless? Honestly, everything you've said here is ridiculously offensive and closed-minded, and says a lot more about your attitude than the quality of rap music.
Try writing a rap song. Program the beats, write the lyrics, perform them on tape, mix and master the track, and throw in a live freestyle while you're at it. Then come back and tell us that hip-hop requires no talent.
A lot of rap is terrible. Nobody's going to argue with that. But so is a lot of metal -- I don't think even you can argue with that. So why throw out the bad with the good?