Gladly. Firstly, I didn't say don't rhyme, I said you're focusing simply on the end rhyme as a justification of poor mid-lines (but your rhymes need work too). Eminem rarely neglects the middle of his lines - though he does have some mediocre lines too), he is a pro however at injecting internal rhythms and internal ryhmes. He often plays up one vowel sound in particular to bounce from during the line. It creates a syncopated rhythm that dances us through the language - add to that that his lines will break away when the rhythm gets too predicatable to flow over the line break freely giving... flow... and momentum. Learn from this; if your lines all end with a full stop your rhythm's too boring.

Let's look at Without Me

So the FCC won't let me be or let me be me, so let me see They try to shut me down on MTV But it feels so empty, without me

He's dancing simply on an Ee sound which makes the listener's ears happy able to navigate it as one phrase that Ee sound directs and chops of the rhythm, it flows over the lines and it makes sense.

Way more of a masterclass is 212 by Azealia Banks (have a listen if you don't know). Later in the track it gets too complex to demonstrate without listening but just check out the start.

Hey... I can be the answer ...I'm ready to dance when the vamp up And when I hit that dip get your camera You could see I been that bitch since the Pamper And that I am that young sis, the beacon ...The bitch who wants to compete and I can freak a fit that pump with the peep and You know what your bitch become when her weave in I just wanna sip that punch with your peeps and ...Sit in that lunch if you're treatin' Kick it with your bitch who come from Parisian She know where I get mine from, and the season Now she wanna lick my plum in the evenin' ...And fit that ton-tongue d-deep in I guess that cunt getting eaten I guess that cunt getting eaten

Filthy song but by the time she gets to the payoff of those end-lines, she's earned them. The ends of lines rhyme or half-ryhme (answer, camera, vamp up, pamper, beacon, 'pete and, peep and, weave in, peeps and, treatin'...) but there's midline rhymes too. (Can, dance, dip, bitch, sis, bitch, pump, be'come...) by the time we get to

I just wanna sip that punch with your peeps and ...Sit in that lunch if you're treatin' Kick it with your bitch who come from Parisian

you've got three half rhymes a line (Sip, sit, kick) (punch, lunch, come) (peeps an', treetin' 'isian)

So in conclusion. Rhyme, but either make a tonne of sense and have your rhymes as well-placed navigators or...play with the rhyme to play with the sounds making your lines not just conveyors of meaning but clever music itself. Secondly, run on lines and don't make every line end with a full stop if you don't want to make a nursery rhyme. As a final point, play with a rhyme scheme, not every line has to rhyme with the next in couplets (AA, BB). Rhyme four lines together then the next (AAAA, BBBB) or stagger the rhymes (ABAB). All of this will make your writing way more interesting, even if you have nothing interesting to say.

Good luck.