I can't explain the popularity of crap-rap. I really don't understand it, and have also been attempting to ignore it for years hoping it would finally die.
I actually like certain rap 'music'. I think the art itself is extremely interesting and fun to listen to. The thing is the field seems to be so watered down. There's a handful of standout lyricists I've heard that I enjoy but they seem to be obscure. Rap is about lyrics, and most rap lyrics seem to be a waste of time, leaving what's left as horribly bad synth....something.
Paradoxically, Eminem's The Slim-Shady lp, much decried and teeth-gnashed as un-hardcore or 'too pop', not to mention hyped from controversy, is actually one of the best complete rap albums I've ever heard. Provided you like tounge-in-check psychedelic shock horror humor. That's the thing though...the record has an actual manifesto and subject matter, and skill. Deltron 3030 is good too. I also like Chali 2na from Jurrassic 5. The few sporatic outcrops of talent in a sea of *expletive deleted*it puzzle me. It's as if people haven't figured out what rap is, what makes it good, or they haven't cared, so it never took off and stagnated. It would be as someone invented the electric guitar, and nobody noticed, and you have these handful of people out there doing rock-and-roll, and it's not catching on, and nobody is noticing, or something. I just can't figure out why rap isn't better, when it seems it should be.