My take on D.O.C. is that he's in my top 10 greatest emcee of all times and one of the greatest emcee in hip-hop. If D.O.C. wouldn't got in that car crash, we will be talking about who's the greatest of all time DOC, RAKIM, JAY-Z, BIGGE OR PAC.
like you said DOC had the lyrical abilities, cadence, flow, story telling, subject matter, voice, wit, and the pen game. When he flipped his voice for Funky Enough that shows how talented he is, using a Rasta voice on point and it didnt sound force at all.
DOC have a hip-hop classic in No one can Do It Better, wrote for 5 classic albums Eazy Duz It, Straight outta Compton, Niggaz4life, The Chronic and Doggystyle... That's 6 Classics under his belt.