subject matter is the biggest knock on eminem, nikkas simply can't relate to a lot of the shyt he rapped about. nikkas weren't hating their moms, plotting to kill their baby moms and high off pills
but if someone wanted to learn how to employ flawless rhyme schemes and properly structure verses from a technical standpoint, you can just tell them to listen to late 90s/early 2000s eminem. despite what most people think, rapping well and making it sound good isn't an easy thing to do and he always made it seem so effortless.
that boy was a problem in his prime and he has a sincere respect and admiration for the culture and its history...he's forgotten more about hip hop than most people will ever learn.