Sample of Black and Yellow Lyrics:
Stay high like how I'm supposed to do
That crown underneath them clouds can't get close to you
And my car look unapproachable
Super clean but it's super mean
She wanna **** with them cats, smoke weed, count stacks
Get fly, take trips and that's that, real rap
I let her get high, she want and she feel that
Convertible drop fill, '87 and the top peel back
Sounds like a winner to me.
tm, I would say that the issue is not so much that rap has nothing to say, but rather, the rap that pop-music stations play, and hence we get exposed to, has nothing to say. The song under discussion being a great example. As near as I can decipher, it is about how rich the artist is, how lavishly he spends his money, the number of "hos" with whom he copulates, and his fancy car. There is a lot of thoughtful rap out there, it just does not get radio play on any popular station.
edit: I am sure if you pulled out a snippet of "Back in Black" lyrics you could find something with a similar lack of applicability.