Please give me a little more credit than that; of course I've listened to rap, otherwise I wouldn't have an opinion on it. Eminem's first two CDs were awesome (I haven't heard much of his work after them), I like Will Smith, and groups like Run DMC, Public Enemy and Beastie Boys are among my favoured in the genre. I'm also a huge fan of The Flobots'
Handlebars, and I can't stress enough how important Tupac was.
That doesn't change my observation that in recent years, rap has generally abandoned the qualities and social messages that existed when Run DMC and the like were prominent. Tell me how "move *****, get out tha way" has a social message. Also Kesha (I refuse to use the dollar sign in a name) needs to die in a fire; "singing" about nothing but drinking and being a whore is no better.
Message aside though, if the lead voice (be it vocal or instrumental) isn't melodic, then it's not music, it's words being spoken with musical backing. There's a difference. Like I said, I'm not condemning rap as not being worth listening to, I'm just saying it's not music, it's something else.