Eh, to me that's usually a defining characteristic of where the art comes from. Classic rock may have boasted a ton of great singers, but that's because it'd ceased to be a folk art and become a commercial art. The first real "rock stars" who wrote and performed *their own* material for their own new audienced were often not the best singers or musicians (Dylan, anyone?).
Same with rap. Golden Age rap was definitely more like a folk art, right off the streets with no major label support. ...And the music was often simple and rappers atonal. Only as it's become commercialized have we seen that polished up.
I definitely appreciate raw talent. I like polished skill, too. But I can take either.
And Shebib doesn't write Drakes lyrics, AFAIK. But it'd help if you could point out some of the "random things" you're talking about.