I think one thing you can say good for Eminem is that his rhyme schemes are always dope as fuck. As far as I can think in this moment, nobodies rhyme scheme is as good, and by rhyme scheme, I mean actually where the rhymes are, rather than what words are rhymed, e.g:

"My lazer disk will make you take a razor to your wrist/
Make you sat-an-ist/-ic, make you take the pistol to your face/
And Place the clip and cock it back and let it go until your brains/
are rippin/
out ya skull so bad to sew you back would be a waste of stiches."

If you actually look at this section, from a poetic point of view, you can see just how complex the rhyme scheme is, same goes for:

"You might see me walkin/
You might see me joggin/
You might see me walkin a dead rottwieler dog/
with his head chopped off/
in the park with a spiked collar/
hollerin at him cuz the son of a bitch won't quit barkin/"

I really can't think of anybody who's rhyme schemes are as complex.