You're right, it is quite short-sighted of me to say.
Perhaps I take it for granted that I can rap (you'll have to take my word for it) with very little effort, actually. Truthfully, I don't really hate rap, and I don't doubt there are talented rappers out there... it's just I don't normally hear any.
There are actually some rap artists I like, and I do like to hear rapping in the midst of other songs of different genres. Like Rage Against the Machine, or my favorite band, The O.C. Supertones. They're a ska band, but check out these songs:
http://www.youtube.com/watch?v=JGtpeQnLzGwhttp://www.youtube.com/watch?v=9YQZLy_Fxushttp://www.youtube.com/watch?v=9Ls_3HhHeI8You're right, it takes talent. Personally though, I've grown quite a degree of animosity towards mainstream rap. Mostly because a friend of mine keeps trying to play that crap in other people's cars (like mine, and I tell him no, and now he doesn't ride in my car anymore. My decision, not his, and not just because of his choice of music). Lil' Wayne is probably the worst now. He really is that guy they pulled off the street and he just babbles nonsense in the microphone while a music track loops behind him. His singing voice makes my ears bleed.
There are some rap artists that I think are really good, but most people don't even know about them. It's saddening, really, that the real rap talent is hidden, and the crap is displayed for everyone to hear.
And what's really bothering me is all the auto-tuning all the time. I've seriously had enough of that. It seems to me like they just can't sing for real, so they use a machine to make them sound good, and that's all they have. I don't know if it's true or not, but that's the way I perceive it.
But the absolute worst to me is that most of the rappers I hear, more than anything, don't represent anything worthwhile. Their lyrics are bogus, and all they do is talk themselves up or sing about women like sex objects. They just talk about fantasies... very sick and wrong fantasies. I know, not all rappers are like that, but that's what's on the radio, at the bowling alley, in the mainstream. Perhaps rock isn't any better in your opinion, (but I would beg to differ, rock artists typically have a more meaningful purpose when they write lyrics) but no other form of music is quite so blatant in the abuse of the English language, and women, and each other.
Show me, please, a rap artist with a deeper purpose than themselves, and I will change my mind.