Honestly it all depends on packaging bruh. Overall is kind of a hard box to put any of the greats in because they offer their own take on music. If we are talking technically sound as an MC, he's not top 20. If we are talking creatvity, he's definetly in the top 20. As far as song writing, easily top 5. But most important, transparency and relatability is top 5.
The only reason I feel drake has a large audience is because of how relatable his music really is. At some point all of us can relate. Honestly he does this in a way i've only seen tupac and nas be able to do. He basically approaches songs like a movie script with acted out scenes.