Ben Shapiro is diving headfirst into the rap game -- he's got a new single and an accompanying music video, and it's doing numbers ... this despite some poor reactions.

The famous conservative talk show host and editor of The Daily Wire -- who's known for his skill on a mic, but not in the MC capacity -- was featured on wrestler-turned-rapper Tom MacDonald's new single ... supplying the guest verse with bars!

Their track together is called "Facts" ... and Ben's 16 takes aim at actual rappers in the game, like Nicki Minaj, Cardi B and Megan Thee Stallion ... among others. He's wearing a hoodie in this thing as he raps about making money off compound interest, all while his haters live with their parents. Yeah, it's classic Shapiro ... dude loves to flex his intellect.

Anyway, the song's pretty polarizing ... and not just because of the lyrical content, which references culture wars and defunding the police. In terms of listen-ability, it's ... jarring.

As you can imagine -- Ben himself is controversial, and has a ton of haters too ... so, it's no surprise the track's generating a ton of bad reviews on social media right now, with lotsa folks calling it cringe, uncool, goofy and a contender for the worst verse of all time.

In his rap, Ben calls on his supporters to download and stream the song ... and that looks like what's going on, because it's doing pretty well on the music charts. So ... a win?

'Facts' is currently No. 2 on iTunes, between Britney Spears and Justin Timberlake ... and Ben's doing an early victory lap on social media ... taking more shots at Nicki along the way.

Ben's thanking his parents for paying for 15 years of classical violin records and he says he and Tom have "officially made hip-hop great again, as was always my lifelong dream."