OK, I'll play:
Theres all kinds of crappy music associated with any genre. There are a LOT of crappy talentless MCs with Rent-A-Ho' making recordings. There are also tons of crappy death metal bands all playing the same sounding garbage even though they all try to tell you how "original" their sound is because they farted in the vocal-booth and believe that they invented a whole new genre called "Aggressive Poop-Core"
With that said, their are also PHENOMENAL death metal bands (Dimmu Borgir and Kamelot come to mind) but there are also PHENOMENAL rappers ( Tech N9ne comes to mind)
These guys' flows are like polyrhythmic drummers. Think you can just walk up to a mic and spit this game without practice and defining/redefining one's skill? Try it