Here's the problem.
Dre is a funk/soul artist just as much as he is a hip-hop artist.
The Chronic is a funk record. It has live instrumentation, it has Parliament-Funkadelic samples (hell, the name G-Funk is a play on P-Funk), it even has George Clinton himself and other P-Funk musicians all over the record - Dre even rocks a Funkadelic t-shirt in the "Dre Day" video.
"2001" is a soul record - Example A
Now, the climate in the music industry post-Napster largely moved away from sample based beats (with some exceptions like Kanye) because there's less money and artists don't want to share credits and pay for sample usage when they are making less money than they used to.
I didn't hear a huge amount of soul and funk in the leaked Detox tracks nor the Compton record. And that is what Dre excels at.
It's also the same reason the last two posthumous Tupac albums sucked ass. Mechanical soulless plastic beats with no groove. You're gonna do Pac like that? The man whose biggest hit was based on "The Way It Is" by Bruce Hornsby? The man who regularly, regularly sampled Prince, Cameo, Zapp, P-Funk, jazz artists like Earl Klugh, DeBarge, Guy, Kool & The Gang, Stevie Wonder, Bootsy Collins?
Shit is fucking lame. Funk and Soul are dominated by some of the greatest musicians in the world. That's why 99% of all the best hip-hop is sample-based.