I've grown to like it more and more. Royce's rhymes and flow are great, the beat is simple but fresh, and Em actually has some great rhymes. I was annoyed at first that he's got the shouty delivery, but I've gotten used to it and started paying attention to how good the rhymes are.
Starting at this point, it's the same rhyme scheme until the end of the song - pretty impressive:
[Royce]
I’ma get rich or I’mma die trying
thats why its either kill or be killed
so call me suicide homocide Ryan
[Eminem]
Theres a bomb inside my head
I’ma live wire, I am on the edge
teetering on it like I tore the iron mike
get on a nut like a tyre iron
I have no desire stopping, so why would I drop and roll,
that’s how much on fire I am
rappers are fun and I’m the time cause I’m just flying by ‘em
man I’m laughing at ‘em the entire time, why am I up?
cause tribulations I have triumphed bitch I’m fired up
so it’s time for me to slit your f-cking lighter, light the sky up
Plus, lots of other "internal rhymes" in there involving the "i" sound that I didn't bold.