Well said, Nate...I was about 8 years old (I'm 31 now) when I first heard one of his first songs, "Gyrlz They Love Me". I can put him in the same class as Big Daddy Kane and Biz Markie, as they made hardcore-sounding songs without the vulgarity. You can't make artists like Heavy (and the others from that Golden-age of hip-hop) anymore because the majority of today's mainstream artists lack the substance in their songs. I can never remember hearing anything negative about Heavy; he was an artist that appealed to damn-near everyone, and like you said...if you didn't like his music, you have no chance in liking hip-hop, period.
I was totally shocked to hear of his passing, and I thought that he was a few years older than he was. Then, over the weekend, we could have had another potential passing as well, in Erick Sermon (and he's had his share of personal issues over the years, including a failed suicide attempt). Thankfully, he's doing better.
RIP Heavy D